Uniden America 70001 FLOATING VHF MARINE RADIO User Manual pt 1

Uniden America Corporation FLOATING VHF MARINE RADIO pt 1

User Manual pt 1

RADIO VHF MARITIME FLOTTANTE
OWNER’S MANUAL
GUIDE D’UTILISATION
FLOATING VHF MARINE RADIO
MHS335d
MAKING A DISTRESS CALL
Lift the red cover. Press and hold the DISTRESS
key
for three seconds. Your radio transmits
your ship’s location every few minutes until you
receive a response.
NOTE: If the radio displays
Enter User MMSI
, cancel the automac
distress call and make a normal voice distress call.
Making a Voice Distress Call
Speak slowly - clearly - calmly.
For future reference, write your ship’s name & call sign here:
1. Make sure your radio is on.
2. Press the 16/P
key
to switch to Channel 16 (156.8 MHz). (If the corner of the display
does not show 16, press the 16/P
key
again until it does.)
3. Press the PUSH-TO-TALK
key
and say: “MAYDAY -- MAYDAY -- MAYDAY.”
4. Say “THIS IS {name of your ship (three times)} and call sign/ship registration
number (once).”
5. Repeat “MAYDAY {name of your ship}” once.
6. Tell where you are: (what navigational aids or landmarks are near, or read the
latitude and longitude from your GPS).
7. State the nature of your distress (e.g. are you sinking, medical emergency, man
overboard, on fire, adrift, etc. ).
8. State the type of assistance you need (medical, towing, pumps, etc.).
9. Give number of persons aboard and conditions of any injured persons.
10. Estimate present seaworthiness of your ship (e.g. how immediate is the danger due
to flooding or fire or proximity to shore).
11. Briefly describe your ship, giving ship name (e.g. “Blue Duck is 32 foot cabin cruiser,
white hull, blue deck house”).
12. Say: “I WILL BE LISTENING ON CHANNEL 16.”
13. End message by saying “THIS IS {name or call sign of your ship}, OVER.”
14. Release the PUSH-TO-TALK
key
and listen.
If you do not get an answer aer 30 seconds, repeat your call, beginning at step 3, above.
Lift the red cover
and press the white
DISTRESS button
underneath.
FAIRE UN APPEL DE DÉTRESSE
Soulevez le couvercle noir. Maintenez DISTRESS
enfoncé pendant trois secondes. Votre radio
transmettra l’emplacement de votre bateau toutes
les quelques minutes jusqu’à ce que vous receviez
une réponse.
Remarque : Si la radio ache
Enter User MMSI
, annulez l’appel de
détresse automaque et eectuez un appel de détresse vocal
normal.
Faire un appel de détresse
Parlez lentement – clairement – calmement.
Pour toute référence ultérieure, écrivez ci-dessous le nom et l’indicatif d’appel de votre
bateau:
1. Vérifiez si votre radio est en marche.
2. Appuyez sur la touche 16/P afin de commuter au canal 16 (156,8 MHz). (Si le canal 16
n’apparaît pas à l’affichage, appuyez de nouveau sur la touche 16/P jusqu’à ce qu’il soit
affiché.)
3. Appuyez sur le bouton Push-to-Talk et dites:“MAYDAY -- MAYDAY -- MAYDAY”.
4. Donnez l’identité de votre navire en disant : “ICI {nom de votre bateau (trois fois) ou indicatif
d’appel et le numéro d’identification de votre bateau (une fois)}”.
5. Dites “MAYDAY {nom ou indicatif d’appel de votre bateau} une fois”.
6. Donnez votre position : (quels sont les points de repère ou aides à la navigation près de vous
ou lisez les coordonnées de longitude et de latitude apparaissant sur votre dispositif GPS).
7. Révélez la nature de votre détresse (par exemple, nous sommes en train de couler, urgence
médicale, un homme à la mer, un incendie, nous sommes à la dérive, etc.
8. Révélez la nature de l’aide désirée (médicale, remorquage, essence, etc.)
9. Donnez le nombre de personnes à bord et les conditions des blessés, s’il y en a.
10. Donnez la condition de navigabilité actuelle de votre navire, tel que le degré de l’urgence par
rapport une inondation, et une incendie.
11. Donnez une brève description de votre navire en donnant le nom du bateau (par exemple,
“Blue Duck est un yacht de croisière de 32 pieds, avec une coque blanche et un rouffle bleu.).
12. Dites : “JE VAIS ÉCOUTER SUR LE CANAL 16”.
13. Terminez le message en disant “ICI {nom ou indicatif d’appel de votre bateau}, À VOUS”.
14. Relâchez le bouton Push-to-Talk du microphone et écoutez.
Si vous n’obtenez pas de réponse après 30 secondes, répétez l’appel en commençant à l’étape 3
ci-dessus.
Soulevez le
couvercle et
appuyez sur le
bouton DISTRESS
blanc en dessous.
Table of Contents
INTRODUCTION .......................E-3
FEATURES ................................E-3
WHAT'S INCLUDED ..................E-4
PARTS OF THE MHS335BT ...... E-4
Front View ................................. E-4
Back View .................................E-5
Charger ..................................... E-6
READING THE IDLE SCREEN .. E-6
Display Icons and
What They Mean ...................E-6
HOW IT WORKS .......................E-8
USING THE POP-UP
KEYBOARD ............................E-8
MENUS ......................................E-8
DISTRESS MESSAGE
Menu ...E-10
GENERAL SETUP
Menu .........E-10
RADIO SETUP
Menu ............... E-11
GPS
Menu ...............................E-12
WAYPOINT SETUP
Menu .......E-12
BLUETOOTH
Menu ................. E-12
DSC SETUP
Menu ..................E-12
ABOUT
Menu ..........................E-13
RESET (To Factory Defaults)
Menu ...................................E-13
USING SOFT KEYS ................. E-13
MOB Soft Key .........................E-14
WX Soft Key............................E-14
CALL Soft Key ........................E-14
HILO Soft Key ......................... E-16
TRI Soft Key............................E-16
MEM Soft Key ......................... E-17
SCAN Soft Key .......................E-17
COMP Soft Key .......................E-17
NAV Soft Key ..........................E-17
WPT Soft Key .........................E-17
BT Soft Key ............................. E-17
SPKR Soft Key........................E-18
OPERATION MODES ..............E-18
Normal ....................................E-20
Scan ........................................E-20
Weather ..................................E-22
SETTING UP THE
HARDWARE ........................E-23
ATTACHING THE ANTENNA ...E-23
INSTALLING THE BATTERY ...E-23
MOUNTING THE CHARGER...E-23
Charging the Battery ............... E-23
Charging the Radio with
Battery Pack Installed..........E-24
Charging the Battery
Pack Only ............................ E-24
Important Notes on
Charging the battery ............E-24
SETTING UP YOUR RADIO ...E-24
TURNING IT ON .....................E-24
ENTERING THE
USER MMSI ..........................E-24
SETTING IT UP ........................E-25
Acquiring GPS Location ..........E-25
Changing the Volume .............E-25
Setting the Squelch Level .......E-25
Setting the UIC Channel
Mode (USA/CAN/INTL) .......E-26
Setting Key Lock ..................... E-26
Setting WX Alert Mode ............ E-26
Setting FIPS Codes ................E-26
Adjusting the Backlight............E-26
Adjust the LCD Contrast .........E-27
Turning the Key Beep
On and Off ........................... E-27
OPERATING THE RADIO ....... E-27
Making a Transmission ...........E-27
Changing theTransmission
Level ....................................E-27
Saving the Channel into
Memory ...............................E-28
Using the LED Light ................ E-28
DIGITAL SELECTIVE CALLING
FEATURES (DSC) ...............E-28
WHAT IS DSC? .......................E-28
MMSI NUMBERS ..................... E-28
Entering MMSI Numbers ........E-29
USING THE DIRECTORIES ....E-29
Individual Directory .................E-29
Group Directory.......................E-30
MAKING DSC CALLS ..............E-30
Calling a Single Station
(Individual Call) ...................E-32
Calling a Particular Group
of Ships (Group Call) ...........E-32
Calling all ships
(All-Ships Call) .....................E-32
MAKING AN AUTOMATIC DISTRESS
CALL ........................................E-33
Canceling an Automatic |
Distress Call .......................E-33
Resending an Automatic
Distress Call .......................E-33
Receiving an Automatic
Distress Call
Acknowledgement ...............E-33
Receiving a Distress Call ....... E-33
DSC CALLS .............................E-34
Individual DSC Call ................. E-34
Group DSC Call ......................E-34
Answer a DSC Call .................E-34
DSC Call Logs ........................E-34
Making or Returning a Call .....E-35
TEST CALLS ............................ E-36
Making Test Calls (Test) ......... E-36
Receiving Test Call Setup ....... E-36
POSITION REQUEST AND
REPLY ...................................E-36
Enabling Automatic Position
Reply ...................................E-36
POS Request .......................... E-36
Position Send .........................E-37
DISABLING AUTOMATIC
CHANNEL SWITCHING ........ E-37
GPS FEATURES .....................E-37
GPS OPERATION
OVERVIEW ...........................E-37
GPS MENU ..............................E-38
NMEA FEATURES ..................E-39
Chartplotter Connection ......... E-39
NMEA Output ......................... E-40
ADDITIONAL FEATURES ......E-40
Renaming Channels ................E-40
UNIDEN MARINE APP ...........E-40
MAINTENANCE AND
TROUBLESHOOTING .........E-40
SPECIFICATIONS ...................E-42
REFERENCE TABLES ............E-43
Channel Descriptions and
What They Mean .................E-43
MARINE RADIO CHANNEL
CHART ..................................E-44
WEATHER CHANNELS AND
FREQUENCIES
(US, CAN, AND INTL) ...........E-48
EMERGENCY ALERT (SAME)
SYSTEM ...................................E-49
Types of Events ......................E-49
No Response Event Code ......E-50
REGULATIONS AND
SAFETY WARNINGS ...........E-51
Maritime Radio Services
Operation ...............................E-51
Basic Radio Guidelines ............E-51
RBRC Information .................E-52
COMPLIANCE ........................E-53
Three Year Limited
Warranty ..............................E-54
E-3
Uniden MHS335 Radio Owner’s Manual
INTRODUCTION
Uniden's MHS335BT is a oating, hand-held class D DSC radio with an integrated GPS
receiver. It is also Bluetooth capable so you can use Uniden's smartphone app (iOS and
Android) to set up the radio and text message other VHF text message capable radios.
You can enter other information such as DSC directory information and update the radio's
rmware.
FEATURES
Your radio provides the following key features:
xSubmersible design. Complies with oating JIS8/IPX8 water-resistant standards,
which means the radio can be submerged in 4.9 feet of water for up to 30 minutes
without damage.
NOTES:
The radio will only meet this rating if fully assembled and all rubber seals and
bungs are well maintained and correctly tted. This means that the speaker
microphone bung is inserted, and the battery pack (or case) and antenna are
attached and securely fastened.
After your radio is submerged in water, the sound might be distorted. This
is because there is still water remaining in and around the speaker and
microphone. Just shake the radio to clear excess water, and the sound should
return to normal.
If your radio is exposured to salt water, clean it thoroughly with fresh water
and dry it before turning it on.
The charger is not waterproof.
xMemory Scan mode. Lets you save channels to memory and monitor them in quick
succession.
xHigh/LO power level select. Lets you boost the transmitter power from 1W to 2.5 or
6W for added transmission distance.
xBattery level display and low battery alert.
xDual and Triple Watch operation. These different watch modes let you monitor up to
two Coast Guard Distress/Hailing channels and one weather channel along with one
regular marine channel.
xAll marine VHF channels for the U.S., Canada, and international waters
xEmergency 16/09 Channel monitoring. Set unit to scan one or both of these
emergency channels regularly within normal scanning cycles.
xClass D second receiver is dedicated to monitoring the DSC watch channel 70 to
ensure that no incoming messages are missed.
xNational Oceanic and Atmospheric Administration (NOAA) Weather Channel
watch. Sounds a warning tone when a hazard alert is issued.
xLCD and key backlight/Flashlight/SOS Strobe. Pressing the Light/Lock key initiates
various light options (see Page E-5).
xKey Lock. Locks keys to prevent accidentally changing channels or entering data.
xSelectable Backlight Timer. Lets you select the length of time the backlight will be
on.
xDSC. Lets you call other ships or groups using their unique identication code. This
radio complies with International Class D DSC standards for Handheld GPS/VHF
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Uniden MHS335 Radio Owner’s Manual
marine transceivers.
xGPS (Favorite Position mode). Lets you save your current position as well as
manually enter other positions.You can save positions into a directory to return to them
as desired.
xBread Crumbs. Tags specic GPS points along your route. You can set how far apart
these points should be (seconds, minute, etc) through the menus.
xWaypoints. Create a list of coordinates and use that list to navigate to various
destinations.
xNMEA input/output. Lets you connect to a chartplotter and, through menus,
determine what NMEA data you want to receive.
x10 weather channels available for monitoring.
xMOB (Man Overboard). Lets you lock onto the current position when a Man
Overboard situation occurs.
xCompass Display. Lets you determine the way you want the radio to display your
course - by showing your course and direction or by showing location on an north-
south-east-west display. Automatically auto-plots to a received DSC distress call.
WHAT'S INCLUDED
NOTE: Some of the graphics in this manual may vary slightly from the actual product.
If any pieces are missing or damaged, contact Customer Service at www.uniden.com.
PARTS OF THE MHS335BT
Front View
Antenna
MHS335 Radio
Charging Cradle
AC Adapter DC Adapter
Lithium Ion
Rechargeable Battery
Not shown:
External speaker/
microphone
1 meter NMEA
cable
Belt Clip
Wrist Strap
Mounting Hardware
Note: Thermal sensor on back.
Screen
Ext. Speaker/
Mic jack
Antenna
Power
Push-
to-Talk
Monitor Menu
Direction
Arrows
CLR Light/Lock
Speaker
16/P
VOL/
SQ
Function
Keys
LED
DISTRESS
Microphone
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Uniden MHS335 Radio Owner’s Manual
Key Press to... Press and hold to...
POWER N/A Turn radio on and off.
Push-to-Talk N/A Transmit on a current TX power.
MON key Quickly open and close
squelch (single press/release). Open Squelch.
Soft Function Keys (3)
Activate function assigned to
that key. Function displays on
screen above key. See page
E-13.
NA
MENU KEY Open the menus. NA
◄ / ▲ / ► / ▼Move up, down, left, or right
on a screen. NA
CLR key Returns to the IDLE screen. NA
Light/LOCK key
- Press once to activate the
LCD and key backlight.
- Press twice to activate LED
steady on (Flashlight).
- Press three times to activate
the SOS strobe light.
- Press a fourth time to turn
the LED off.
Lock key input to prevent input
errors.
16/P key
Cycle through call channel,
channel 16, channel 9, and
back to the starting channel..
NA
VOL/SQ key Press once: Adjust volume.
Press twice: Adjust squelch. NA
DISTRESS key Activate DISTRESS screen. Send out default distress signal.
Back View
Belt clip
Battery
Battery charging
contacts
Battery
latch
Wrist strap slot
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Uniden MHS335 Radio Owner’s Manual
Charger
READING THE IDLE SCREEN
The Idle screen shows different information depending on what you are doing. Not all icons
display on every screen. This dummy Idle screen displays many of the possible icons. The
table below shows possible icons and what they mean.
ALT
INTL
6W
TRI
MEM
WX 15
COMMERCIAL
MOB WX CALL
<
>
TX
LAT:32˚53,6604N
LON:096˚59,3158W
TIME:20:47 Local
DATE:Aug 23,2017
1
8
9
7
65432
101112
16
15
14
13
17
Display Icons and What They Mean
Number Icon What it means
1 Battery level
2INT Channel mode (USA, INTL, or CAN)
3 Displays when mail is available.
4ALT Weather Alert
Charging
contacts
CHARGE LED
Screw holes
NMEA
contacts
Screw hole
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Uniden MHS335 Radio Owner’s Manual
Number Icon What it means
5Flashes when satellite acquired. Does not display if no satellite
acquired.
6Displays when Bluetooth is turned on.
7
1W,
2.5W, or
6W
Power output.
8 TX or RX Indicates Transmitting (TX) or Receiving (RX).
9Various
Text Channel Name
10 Soft Key
#3 Name of soft key (see page E-13).
11 Soft Key
#2 Name of soft key (see page E-13).
12 Soft Key
#1 Name of soft key (see page E-13).
13 GPS Data Latitude, Longitude, Time, and Date at current position.
14 WX Displays when Weather mode active.
15 MEM Displays when a channel is saved into memory.
16 TRI Displays TRI (Triple) or DUAL (Dual) watch mode as set in Menus.
17 Channel
Number Current channel number.
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Uniden MHS335 Radio Owner’s Manual
HOW IT WORKS
The MHS335 uses a 3-part operating structure: Menus, Soft Keys, and a pop-up keyboard.
These elements work with each other to quickly set up and operate your radio.
xMenus - Press the MENU key to access the menus (see page E-8).
xSoft Keys - The soft keys relate to the three keys on the bottom of the screen. Many of
these keys can access functions that are set up through the menus (see page E-13).
xPop-Up Keyboard - Some of the menus and soft keys require alphanumeric input. The
radio brings up a keyboard for this. You can change the keyboard from alphanumeric
characters to special characters.

When you need to enter text, a digital keyboard pops up. "Type" on this keyboard by using
the ▲, ▼, ►, and ◄ keys on the radio's keypad to move a curser through the keyboard.
Press
SELECT
to select that character and move to the next spot.
xThe
ABC
/
abc
key switches between capital and lower case letters.
xSelect the
@&?
key to switch to the special character keyboard. Select
ABC
/
abc
to
switch back to an alphanumeric keyboard.
xAfter using the ▲, ▼, ►, and ◄ keys on the radio's keypad to select a letter, press
SELECT
to "type" the letter. The letter then displays on the screen.
xSelect the ◄ and ► keys to move the curser backwards or forwards into the entry.
xSelect
ENTER
to move the curser to the next line.
xSelect
del
to delete the character to the left of the curser.
BACK
TEXT SELECT
C
B
A
D
M
L
K
N
WVU
X
3
2
1
4
E
F
G
H
I
J
O
P
Q R
S
T
Y Z
5 6
7
8
9
0
Enter
space
@&?
abc
del
TITLE
Switch between all
capital letters and
lower case letters
Move curser to
next line
Switch to special
character keyboard
Go to previous
screen
Varies with screen
type. Can be
CONFIRM, NEXT, etc.
Select letter
chosen
Move curser
to previous or
next letter
Delete character
to the left of the
curser
MENUS
Various menus let you establish guidelines and parameters for sending and receiving calls.
Menus also let you set your radio’s characteristics such as brightness, Code selection, and
contrast.
The MENU key accesses menus that let you set the way your radio operates. The following
Menus display on the screen.
xDISTRESS MESSAGE (see page E-10 for details)
xGENERAL SETUP (see page E-10 for details)
xRADIO SETUP (see page E-11 for details)
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Uniden MHS335 Radio Owner’s Manual
xGPS (see page E-12 for details)
xWAYPOINT SETUP (see page E-12 for details)
xBLUETOOTH SETUP (see page E-12 for details)
xDSC SETUP (see page E-12 for details)
xABOUT (see page E-13 for details)
xRESET (see page E-13 for details)
Use the UP ( ▲) and DOWN ( ▼ ) keys to nd a menu category. Press the
SELECT
soft
key to select and go to that menu.
Select
BACK
DISTRESS MESSAGE
GENERAL SETUP
RADIO SETUP
GPS
WAYPOINT SETUP
BLUETOOTH SETUP
DSC SETUP
ABOUT
RESET
MENU DESCRIPTION REF. PAGE
DISTRESS
MESSAGE
Types of distress messages such as ooding,
capsizing, and man overboard.
Page E-10
GENERAL SETUP Basic radio conguration such as backlight,
key beep, and reset to factory defaults.
Page E-10
RADIO SETUP Basic radio conguration such as channel
mode, priority channel, and scan type.
Page E-11
GPS Set up GPS conguration such as time offset,
unit of measure, and direction.
Page E-12
WAYPOINT SETUP Establish Waypoint and route directories and
routing information.
Page E-12
BLUETOOTH
SETUP
Turn Bluetooth on and off and provide a
broadcast identier (name) for your radio.
Page E-12
DSC SETUP Congure DSC calling and directories. Page E-12
E-10
Uniden MHS335 Radio Owner’s Manual
MENU DESCRIPTION REF. PAGE
ABOUT Displays radio, GPS, and Bluetooth rmware
version numbers.
Page E-13
RESET (To Factory
Defaults)
Reset the radio to factory defauts. All
programming is lost, but not the MMSI number.
Page E-13
DISTRESS MESSAGE
Menu
Select a distress message type to transmit when you use the DISTRESS key on the side of
the radio. See page E-33 for information on how to send a distress message.
MENU ITEM DESCRIPTION
Undesignated Send this type when you, your crew, and/or your ship are in
clear danger and there is no time to search for a more inclusive
designation to use.
Fire, Explosion Send this type if there has been an explosion or a re on the ship
and you are in immediate danger.
Flooding Send this type if your ship is taking on water and you are in
immediate danger.
Collision Send this type if your ship has collided with another ship or
obstruction.
Grounding Send this type if the ship has run aground.
Capsizing Send this type if the ship is capsizing.
Sinking Send this type if the ship is sinking.
Adrift Send this type if the ship is adrift and unable to navigate on its own.
Abandoning Ship Send this type if you and the crew must evacuate the ship.
Piracy Send this type if your ship is under attack or unauthorized boarding.
Man Overbard Use this type if someone has gone overboard and you are unable
to assist/locate them.
Distress messages are always transmitted on channel 70 at maximum RF power (6W).
GENERAL SETUP
Menu
You can set up how your radio operates through the
GENERAL SETUP
menu.
MENU ITEM DESCRIPTION
Backlight Set how bright the backlight is and how long the backlight stays on.
Backlight level: Off, 1 - 5 (Default = 3). Backlight duration: Always
on, 5 sec , 10 sec, 20 sec, or 30 sec.
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Uniden MHS335 Radio Owner’s Manual
MENU ITEM DESCRIPTION
Contrast Set how dark the screen images are against the background.
Contrast levels are 1 - 8 (Default = 4). (See page E-27.)
Key Beep With Key Beep turned on (default), the radio will beep every time
you press a key.
SOS Strobe The LED on the front of the radio acts as a strobe light. Set water
activation and timeout duration here.
Inactivity Timer Set how long the radio remains inactive before it times out.
Key Assignment Reassign soft key functions to different keys.
Reset Radio to
Factory
Return your radio to the factory defaults. You will lose all
programming.
RADIO SETUP
Menu
Use the RADIO SETUP menu to ne tune how the radio will operate. For example, you can
rename channels, set channel modes, etc.
MENU ITEM DESCRIPTION
Channel Mode Set to USA, CAN (Canada), or INTL (International). (See page
E-26.)
Weather Radio Turn weather alerts on or off (see page E-26) and enter S.A.M.E
codes (see page E-26).
Dual/Tri Watch Turn Dual or Triple Watch on and off (see page E-18).
Priority Channel Select a channel to be the priority channel when scanning. (See
page E-17.)
2nd Priority
Channel
Select a channel to be the secondary priority channel when
scanning. (See page E-17.)
Scan Type Select a scanning type: Priority Scan or Memory Scan (see page
E-17.)
Scan Pause
Timer
Set how long scanning will pause when the
SCAN
soft key is
pressed.
Channel Name Rename a channel (see page E-40).
Noise Cancel Select noise cancelling for received or transmitted signals.
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Uniden MHS335 Radio Owner’s Manual
MENU ITEM DESCRIPTION
Receive Audio
Pitch
Set audio pitch.
- Normal
- Mid Range
- Highs & Lows Boost
- Lows Boost
- Highs Boost
GPS
Menu
The GPS section on provides an overview of the GPS menu options and how they work.
WAYPOINT SETUP
Menu
Waypoints (also called landmarks) mark specic points in traveling between two locations.
They serve as directional indicators. For example, once you reach a specic waypoint,
you need to adjust your course to reach the next waypoint (and as you continue, your
destination). See page E-17 for details on setting up waypoints.
MENU ITEM DESCRIPTION
Waypoint Directory Displays a list of all available waypoints.
Current Position Displays latitude, longitude, time, SOG, and COG.
Route Directory Displays a list of routes stored in the directory.
Routing Method Automatic or Manual
Route Display Displays routes on a compass screen.
Arrival Alarm Enter the distance at which you want the radio to alert you that
you are close to the destination.
BLUETOOTH
Menu
Smart phones can discover your radio when you turn Bluetooth on with this menu. You can
also change your radio's broadcast identier (name).
DSC SETUP
Menu
You can congure your DSC operation through this menu.
MENU ITEM DESCRIPTION
Enter Radio MMSI Enter the radio’s MMSI number to use DSC features.
Individual Directory Add, edit, or delete individual directory entries.
Group Directory Set up a group with an Group MMSI. Send this GROUP MMSI
number to other ships.Those ships are now part of the group you
created.
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Uniden MHS335 Radio Owner’s Manual
MENU ITEM DESCRIPTION
Auto ACK Automatically send an acknowledgement when you receive a
test call. Options are
Individual ACK
or
Position ACK
request. You
can set Auto/Manual for each option so when you get a call or a
position request, the radio will kow how you want to respond.
Test Call ACK Acknowledge receipt of a test call sent to you.
Individual Call
Ring
Set the amount of time a call will ring before it times out.
Auto Channel
Switch
Set whether or not he radio will automatically switch to channel 16
from your current channel when it receives a DSC call.
Auto MOB Set Turn Auto MOB on and off.
Wait to POS Fix Set how long the radio takes to acknowledge a POS x.
Auto Polling Time Set how long the radio takes between polling activities.
DSC Alarm Setup Turn DSC alarms on and off.
ABOUT
Menu
This menu displays the current software version for the radio, GPS, and Bluetooth.
RESET (To Factory Defaults)
Menu
Using this menu resets the unit to factory defaults, except for the MMSI number. Select
OK
to conrm the reset. Otherwise, select
Exit
to cancel.

MENU operations can set up the radio's conguration and databases. Soft keys use that
information to perform quickly accessed procedures. For example, you can add ships to call
(name and MMSI numbers) through MENU/
DSC SETUP/Individual Directory
. Then select
CALL/INDIVIDUAL CALL
through the soft keys and the ship you added through the menus
displays.
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Uniden MHS335 Radio Owner’s Manual
Default; Scroll Right
Scroll left Scroll right
Soft Key Order
WXMOB CALL
HI/LO MEM
TRI
SCAN
WPT
NAV
BT
COMP
Scroll Right
Scroll Right
Scroll Right
Soft Keys
Soft Key
Operation
ALTINTL
6W
MEM
WX 15
COMMERCIAL
MOB WX CALL
<
>
TX
LAT:32˚53,6604N
LON:096˚59,3158W
TIME:20:47 Local
DATE:Aug 23,2017
SPKR
NOTE: After selecting WX soft key, it changes
to CH to return to the last marine channel.
MOB So Key
The Man Overboard (MOB) soft key does not require setup through the menus.
1. Press the
MOB
soft key and the screen automatically marks your current location
as MOB. The MOB screen displays the latitude, longitude, time, BRG (Bearing to
Destination), and DIST (Distance to Destination). The radio’s GPS supplies this
information automatically. The soft keys change to
BACK, DEL
, and
NAV
.
2. Select
BACK
to return to the previous mode and keep the current MOB information.
3. Select
DEL
to delete the current MOB information and return to the previous mode.
4. Select
NAV
to activate the COMPASS screen. Navigate to your destination
WX So Key
Press the
WX
soft key to display the last WX channel accessed (
WX
changes to
CH
). The
screen displays the latitude, longitude, and time. Press ▲ and ▼ to scroll through weather
channels. Press
CH
to return to the last marine channel.
CALL So Key
The
CALL
soft key opens a
CALL
menu. You can use this menu as a “shortcut” to making
different kinds of calls. You can also send and receive position requests and view the DSC
call logs.
Some call types use the information previously set up in the menus to congure the call
parameters. For example, if you select
INDIVIDUAL CALL
through the
CALL
soft key, a list
of ships that were set up through MENU/
DSC SETUP/Individual Directory
displays.
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Uniden MHS335 Radio Owner’s Manual
Call Menu Option Setup Operation
Distress Message None Press the
CALL
soft key and select
DISTRESS MESSAGE
.
Scroll to distress message type and
press
SELECT
.
Individual Call Enter individual ships
through MENU/
DSC
SETUP/Individual
Directory
.
Press the
CALL
soft key and select
INDIVIDUAL CALL
.
Scroll to the individual ship and press
SELECT
.
Press
SEND
on the
Individual Call
screen.
Group Call Set up a Group name
and MMSI number
through MENU/
DSC SETUP/Group
Directory
.
Give this MMSI
number to the ships
included in the group.
Press the
CALL
soft key and select
GROUP CALL
.
Scroll to the group name and press
SELECT
.
Press
SEND
on the
GROUP
Call
screen.
All Ships None Press the
CALL
soft key and select
ALL
SHIPS
.
Select either SAFETY (hazards in the
water) or
URGENCY
(people at risk).
Test Call Enter individual ships
through MENU/
DSC
SETUP/Individual
Directory
.
Press the
CALL
soft key and select
TEST CALL
. The list of the ships entered
previously displays.
Select a ship and press
SELECT
. A
Transmitting To
message displays.
Position Request Enter individual ships
through MENU/
DSC
SETUP/Individual
Directory.
Press the
CALL
soft key and select
POSITION REQUEST
. The list of the
ships entered previously displays.
Select a ship and press
SELECT
. A
Position Request
screen displays. Press
SEND
.
Position Send Enter individual ships
through MENU/
DSC
SETUP/Individual
Directory.
Press the
CALL
soft key and select
POSITION REQUEST
. The list of the
ships entered previously displays
Select a ship and press
SELECT
. A
Position Send
screen displays your
current GPS location. Press
SEND
.
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Uniden MHS335 Radio Owner’s Manual
Call Menu Option Setup Operation
Auto Polling Enter individual ships
through MENU/
DSC
SETUP/Individual
Directory.
Set the amount of
time between polling
requests through
MENU/
DSC SETUP
/
Auto Polling Time
.
Press the
CALL
soft key and select
Auto
Polling/Activation/Selected ID
. The
Polling
List
screen displays. Press
SELECT
.
Contacts list displays. Press SELECT
again. The Individual ships entered
into thre Individual Directory displays.
Select a ship. Go back to the
Auto Polling
screen, select
Activation/Start
.
After you get an acknowledgement, scroll
to
COMP
soft key. The ship's location
should display on the
Compass
screen.
DSC Log None Press the
CALL
soft key and select
DSC LOG
. The
DSC
CALL LOG
screen
displays a list of options:
DISTRESS
CALLS, RECEIVED CALLS,
and
DELETE
CALL LOGS.
Select a log and press
SELECT
. A Call
Log displays the MMSI numbers of calls
you’ve transmitted or received. Select
an MMSI number and press
SELECT
.
Information for that call displays.
If you select
DELETE LOGS
, the radio
will delete the calls from that log.
HILO So Key
Press the HILO soft key to change the transmission power from 1.5W to 6W to 2.5W. The
transmission power icon displays. (See page E-6 for the transmission power icon LCD
placement.)
NOTE: If the maximum output for a specic channel is 1W only, the output power stays to 1W and
the radio sounds an error tone.
TRI So Key
This soft key displays as what is set in MENU/RADIO SETUP/Dual/Tri Watch. If that
seng is TRI, then TRI displays. If the seng is DUAL, then DUAL displays. See
page E-6 for the Dual/Triple icon LCD placement.
SETUP
Go to MENU/RADIO SETUP
/Dual/Tri Watch
. Select
DUAL
or
TRI
.
OPERATION
Press
TRI
soft key. The screen scans the current channel and the priority channels set in
the menus. The TRI icon displays on the LCD (see page E-6).
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Uniden MHS335 Radio Owner’s Manual
NOTE: If DUAL is set in the menus, then the screen scans the current channel and just the Priority
channel; it does not scan the 2nd Priority Channel.
MEM So Key
Press the
MEM
soft key to save the current channel into memory. If the channel is already
saved into memory, pressing this key will remove it from memory. (See page E-6 for the
MEM icon LCD placement.)
SCAN So Key
The
SCAN
soft key lets you scan combinations of channels saved into memory and priority
channels. Set priority/second priority channels and the channel type through menus.
SETUP
1. Select MENU/
RADIO SETUP/Priority Channel
. Select a DSC channel for priority
channel. (Default = 16.)
2. Select MENU/
RADIO SETUP/2nd Priority Channel.
Select another DSC channel for
the 2nd Priority Channel. (Default = 9.)
3. Select MENU/
RADIO SETUP/Scan Type.
Options are
Priority
(scans both priority
channels and channels saved to memory) or Memory (scans only channels saved in
memory).
OPERATION
1. Press
SCAN
soft key.
2. Radio scans channels according to Main menu setup.
COMP So Key
The
Compass
(COMP) soft key activates the compass screen. Press the
N-UP
soft key
and the screen orients to north. When you’re in N-UP mode, the soft key changes to
C-UP
mode. Press the
C-UP
soft key and the compass orients to the course‘s next Waypoint or
bread crumb, as shown by a black dot
NAV So Key
Press this soft key to to select a previously stored route or waypoint as your destination..
WPT So Key
Waypoints are location coordinates you've entered into the system. Press the
WAYPOINT
soft key to select waypoints to navigate to.
NOTE: The radio shares memory space with ROUTE and can save up to 200 waypoints
SETUP
Search the internet for the location you want (use "coordinates" as part of the search term)
and enter the coordinates through the MENU/
WAYPOINT SETUP /Edit
screen. For example,
search for "Key West Naval Hospital coordinates."
BT So Key
You can send a text message, review text messages, and turn Bluetooth on and off through
this soft key.
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Uniden MHS335 Radio Owner’s Manual
SENDING TEXT MESSAGES
NOTE: You can send texts from your radio or from your mobile device using the Uniden Marine
app, available for Android and iOS.
1. Press the
BT
soft key and select
TEXT MESSAGING
.A pop-up keyboard displays
(
NEW MESSAGE
) with the
TO:
area highlighted.
BACK
NEXT SELECT
C
B
A
D
M
L
K
N
WVU
X
3
2
1
4
E
F
G
H
I
J
O
P
Q R
S
T
Y Z
5 6
7
8
9
0
Enter
space
@&?
abc
del
NEW MESSAGE
TO: _
2. You can enter a stored MMSI number, a new MMSI number, or a stored name (stored
names are linked to a directory entry).
NOTE: The radio recognizes the rst few leers entered and autolls the rest of the entry from the
Individual or Group Directory.
3. Press the
NEXT
soft key and the curser moves to the message area with the letter
"P" is highlighted.
4. Enter your text message, press
NEXT,
and then
SEND.
Press
EXIT
to return to the
previous mode.
VIEW MESSAGING
Select
VIEW MESSAGING
from the BT soft key menu. A list of MMSI numbers representing
calls displays. Select a message and press
REPLY
.
BLUETOOTH ON/OFF
Select
BLUETOOTH ON/OFF
from the BT soft key menu. Turn BT on or off (default).
SPKR So Key
If you drop the radio in water, press the
SPKR
soft key to sound a loud tone. The vibrations
from this tone help remove water from the speaker.
OPERATION MODES
Your radio has three main operation modes: Normal, Scan, and Weather.
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Uniden MHS335 Radio Owner’s Manual
Mode What it does Use it when you want to... To turn it on/off
Normal
Monitors a single marine
channel and lets you talk on
that channel.
Monitor a channel or talk to
another radio.
From any mode,
press CLR.
The Idle screen
displays. Select
a different mode
to turn Normal
mode off.
Scan
- Monitors priority channels
set in the Main menu.
- Monitors all the channels
you save into memory.
- Monitor up to 2 additional
channels in addition to
the channels saved in
memory.
- Check a small group of
regularly-used channels
for trafc.
Press
SCAN
soft key to start
scanning. Press
SCAN
again to
stop.
Weather Monitors the selected NOAA
weather channel.
Hear the current or
forecasted weather.
Press MENU.
Go to RADIO
SETUP
/Weather
Radio.
In addition to the three operation modes, your radio provides three different watch modes
which you can activate during any operation mode. In the watch modes, the radio briey
checks for activity on a specic channel, then returns to its previous operation.
Watch mode What it does To turn it on/off
Weather Alert
Watch
Checks the last-used weather
channel for hazard alerts every few
seconds.
From MENU, select RADIO
SETUP. Go to
Weather Radio
and
select
WX Alert
to turn on or off.
Dual Watch
Checks the priority channel for
activity every few seconds. (Default
priority channel = 16)
From MENU, select RADIO
SETUP. Go to
DUAL/TRI Watch
and select
Dual
to turn Dual Watch
on or
Triple
to turn Triple Watch on
(and Dual Watch off).
Triple Watch
Checks the priority and second
priority channels for activity every few
seconds. (Priority channel default -
16; second priority channel default
= 9)
From MENU, select RADIO
SETUP. Go to
DUAL/TRI Watch
and
select
Triple
to turn Triple Watch on
or
Dual
to turn Dual Watch on (and
Triple Watch off).
Note: Private ships must monitor channel 16. Whenever they are underway. Water-going ships
should have either Triple Watch or Dual Watch on at all mes.
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Uniden MHS335 Radio Owner’s Manual
Normal
xTo transmit, remove the radio from the charger, then press and hold Push-to-Talk.
Release the key when you are nished talking.
xFor the best sound quality, hold the microphone about two inches from your mouth
while you’re talking.
xPress ▲ to move up one channel at a time. Press and hold the key to scroll quickly up
the channels.
xPress ▼ to move down one channel at a time. Press and hold the key to scroll quickly
down the channels.
xTo change the transmit power, press the HILO soft key. The transmit power cycles
through 1W, 2.5W, and 6W, then back to 1W again.
NORMAL MODE WITH WEATHER ALERT
If you activate Weather Alert (MENU/
RADIO SETUP
/WX Alert)
while operating
in Normal mode, the radio checks the most recently
used weather channel every seven seconds. If it detects
a weather or other hazard alert, it will switch to that weather
channel. (If you are actively transmitting, the radio waits until you
nish your transmission before checking the weather channel.)
NORMAL MODE WITH TRIPLE WATCH OR DUAL WATCH
If you activate Triple Watch while operating in Normal mode (MENU/RADIO SETUP
/Dual/
Tri Watch/Triple)
, the radio checks the priority and second priority channels every few
seconds along with the current marine channel. With Dual Watch turned on, the radio only
checks the priority channel and the current marine channel. The radio will not check either
of the priority channels while you are actively transmitting; it waits until your transmission is
nished and then checks the channels.
Scan
There are two Scan modes - Priority and Memory.
SCAN/PRIORITY MODE
Priority mode scans through the channels saved into memory and then the priority channel
[set in the Main menu (see page E-10)]. For example: Memory Channel 1 --> Priority
Channel --> Memory Channel 2 --> Priority Channel --> etc.
SCAN/PRIORITY MODE WITH WEATHER ALERT ON
If Weather Alert is turned on with Priority mode, the radio alternately scans through the
channels saved into memory and the priority channel (Memory Channel 1 --> Priority
Channel --> Memory Channel 2 --> Priority Channel --> Memory Channel X ) and then
scans the most recently used Weather channel.
SCAN/MEMORY MODE
You can save any channel into memory and then use Scan mode/Memory Scan to monitor
those channels from lowest to highest. If the radio detects a signal on a channel, it stays on
that channel as long as the signal is received; when the signal stops, the radio continues
scanning.
wx
Every 7 seconds,
the radio checks
the last-used
weather channel.
WX Alert
on
Monitoring Channel 25
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Uniden MHS335 Radio Owner’s Manual
SCAN/MEMORY MODE WITH WEATHER ALERT ON
If Weather Alert is turned on with Memory mode, the radio scans through the channels
saved into memory and then scans the most recently used Weather channel. (Memory
Channel 1 --> Memory Channel 2 --> Memory Channel N, and then scans the most
recently used Weather channel.
USING THE RADIO IN SCAN MODE
xTo activate Scan mode, set the radio to either
Priority Scan
or
Memory
in MENU/
RADIO SETUP
/Scan Type
. If you select
Memory
, the radio scans channels saved in
memory. If you select
Priority
, go to MENU/
RADIO SETUP
and set the priority channel.
The radio scans this channel in addition to channels saved in memory.
xYou must have at least two channels in memory to start a scan.
xYou can transmit while scanning.
xTo save a channel into memory, select the channel, then scroll to the
MEM
soft key.
Press it to save that channel into memory. The MEM icon displays whenever you tune
to that channel.
xTo remove a channel from memory, set the radio to that channel, then press the
MEM
soft key again. The MEM icon no longer displays and that channel is no longer saved
in memory.
xWhen the radio stays on a channel, press ▲ to leave that channel and resume
scanning.
xTo end the scan, press the
Scan
soft key again. The radio remains on the last scanned
channel.
SCAN MODE WITH WEATHER ALERT
When you activate Weather Alert (MENU/RADIO SETUP
/Weather Radio
) while in Scan
mode, the radio checks the most recently-used weather channel every seven seconds.
1. If the radio receives a weather alert while scanning, it beeps to alert you that there is
an alert on a weather channel. Press any key to stop the alert.
2. A
Weather Alert Reception Conrnation
screen displays. Select OK to display a
conrmation screen.
11
1008 1312 14 17
15
The radio scans about
5 channels in 0.5 seconds.
When it detects a signal, the radio stays
on the channel until you press the
Channel Up button or the signal
stops. Resume
scan
Every 7 seconds, the radio
checks the last-used
weather channel, then
scans the next channel.
wx
WX Alert on
Memory Channel Scan
08 252417151413121110 20
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Uniden MHS335 Radio Owner’s Manual
3. The next screen gives you the option of switching to the weather channel (YES) or
returning to the marine channel (NO).
Scan Mode with Triple Watch or Dual Watch
If you activate Triple Watch (MENU/RADIO SETUP
/Dual/Tri Watch
menu or
TRI
soft key)
while operating in Scan mode, the radio checks the priority and second priority channels
(default = channels 16 and 9) every two seconds, then goes on to scan the next channel in
memory. With Dual Watch turned on, the radio only checks the priority channel:
Press MENU/RADIO SETUP
/Dual/Tri Watch
menu or
TRI
soft key again to cancel Triple
Watch mode.
Select
DUAL
from MENU/RADIO SETUP
/Dual/Tri Watch
to set up
Dual
watch
.
BOTH WEATHER ALERT AND TRIPLE/DUAL WATCH IN SCAN MODE
You can activate Weather Alert Watch and Triple/Dual Watch at the same time. Press
MENU/RADIO SETUP
/Dual/Tri Watch
or the
TRI
soft key to turn on the Triple/Dual watch;
turn on WX Alert through MENU/RADIO SETUP/Weather Radio.
If DUAL watch is activated, the radio scans the priority channel, the current marine channel,
and then the most recently used weather channel.
If TRIPLE watch is activated, the radio scans the priority channel, the second priority
channel, the current marine channel, and then the most recently used weather channel.
Weather
The NOAA weather channels now cooperate with the FCC to alert you of other hazards
besides weather (child abduction alerts, nuclear, biological, etc.). In Weather mode, the
radio monitors one of the 10 NOAA weather channels. If a weather alert signal is received in
Weather Alert mode, the radio sounds an alert tone.
USING THE RADIO IN WEATHER MODE
xYou cannot transmit while in Weather mode.
xTo enter Weather mode, press the
WX
soft key.
xTo turn off the radio’s alert tone, press any key.
09
16
Every 2 seconds, the
radio checks the
priority and second
priority channels,
then scans the next
channel.
Triple Watch on.
Default priority channels 16 & 9.
Memory Channel Scan
08 252417151413121110 20
Every 2 seconds, the
radio checks channels
16 & 9, then scans
the next channel.
Triple
Watch on
Every 7 seconds, the radio
checks the last-used
weather channel, then
scans the next channel. wx
WX Alert on
Memory Channel Scan
08 252417151413121110 20
09
16
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Uniden MHS335 Radio Owner’s Manual
xTo cancel Weather mode and return to the previous marine channel, press the
CH
soft key.
WEATHER MODE WITH WEATHER ALERT WATCH
If you activate Weather Alert Watch through MENU/RADIO SETUP
/Weather Radio/WX Alert
while operating in Weather mode, it operates as a type of “sleep mode.” The radio stays on
the weather channel and mutes the speaker. If the radio detects an alert, it sounds an alert
tone and turns the speaker back on. This mode is very useful when you are anchoring for
the night but want to keep informed of hazards.
WEATHER MODE WITH TRIPLE WATCH OR DUAL WATCH
If you activate Triple Watch (MENU/RADIO SETUP
/Dual/
Tri Watch
menu or the
TRI
soft key) while operating in
Weather mode, the radio checks the priority and
second priority channels, then the current marine
channel, and then the most recently used weather
channel.
With Dual Watch activated (MENU
/
RADIO SETUP
/Dual/Tri Watch
menu) while in Weather
mode, the radio checks the priority channel, the current marine channel, and then the most
recently used weather channel.
SETTING UP THE HARDWARE
ATTACHING THE ANTENNA
The antenna detaches from the radio for easy shipping or storage. To attach the antenna to
your radio, screw it tightly onto the anchor post at the top of the radio.

Your radio comes with a rechargeable Lithium Ion battery; for shipping safety, the battery is
not installed at the factory.
1. Insert the hook on the battery into the notch at the top of the battery compartment.
2. Lower the battery until it rests at in the compartment.
3. Bring the battery latch up and snap it into place.
MOUNTING THE CHARGER
You can mount the charger on any at surface.
1. Use the two holes at the base of the charger as a template to mark the drill holes.
2. Using a 1/8-inch (or 3 mm) drill bit, drill two holes 1/2 inch (13mm) deep.
3. Use the provided screws to attach the charger to the surface.
NOTE: The charger must be mounted at least 2 feet (24 inches) from the compass to prevent
magnec interference with either device.
Charging the Baery
Your radio includes a charger and a rechargeable battery pack. You can recharge the
battery pack in the charger by itself or installed in the radio. Being able to charge the battery
Every 2 seconds, the radio checks
channel 16, then channel 9
09
16 09
16 09
16
Monitoring Weather Channel WX08
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Uniden MHS335 Radio Owner’s Manual
pack by itself is especially useful if you purchase a second rechargeable battery; you can
always have a charged battery available.
Charging the Radio with Baery Pack Installed
1. Insert the radio into the charger, making sure that it slots into the
guide bars and the CHARGE LED on the charger turns red
(charging).
2. The battery is fully charged when the LED turns green.
Charging the Baery Pack Only
1. Unlatch the battery from the radio case. Remove it.
2. Insert the battery into the charger, making sure that the battery
slots into the guide bars and the CHARGE LED on the charger
turns red (charging).
3. The battery is fully charged when the LED turns green.
Cauons:
xUse only the battery and charger supplied with this radio. Using a different
charger or battery can damage the radio and create a risk of re or shock.
xThe charger is not waterproof. If the charger falls into the water, unplug it before
attempting to remove it from the water. After you remove the charger from the
water, please contact Customer Service (see the back cover page for contact
information).
xWipe off dirt or shake water from your radio before placing in the charger if your
radio gets dirty or wet.
Important Notes on Charging the baery
xCharge the battery fully before using the radio.
xDon’t use the charger when the ambient temperature is below 0° C (32° F) or above
45° C (113° F).
xIf the radio is powered down, the battery can charge in about ve hours. (If the radio is
powered on, the battery takes longer to charge.)

TURNING IT ON
Press the POWER key for at least two seconds until the UNIDEN splash screen displays.
Release the POWER key. Press and hold it to turn the unit off.
ENTERING THE USER MMSI
When you power up your radio for the rst time, it displays
MMSI Not Entered
and then
displays a Marine mode screen. User MMSI numbers are unique and cannot be entered
more than once. See Page E-28 for general information about MMSI numbers and how to
get your specic User MMSI number and enter it.
If you must change your user MMSI, instructions are on the Uniden website (www.uniden.
com).
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Uniden MHS335 Radio Owner’s Manual
if you choose to not enter your specic MMSI number at initial start up, you can still use
many of your radio's features. However, you cannot use DSC features.
SETTING IT UP
Even though you can change your radio’s settings at any time, you will probably want to
establish initial settings when you turn it on for the rst time. You can adjust some of these
settings on an as-needed basis, but some settings might only be set once and not need
adjustment at all.
Acquiring GPS Locaon
The MHS335BT automatically acquires your current GPS location when it is turned on.
Turn on the radio and point the antenna towards the sky. It will triangulate your location and
save it.
NOTE: Do not let anything obstruct the antenna, such as a metal cabin ceiling. If the radio displays
an Unable to Aquire message, move to an unobstructed locaon for the antenna.
Changing the Volume
To change the speaker volume, press VOL/SQ to enter Volume Setting mode. Press ▲ to
increase the volume or ▼ to decrease it (Volume levels = 0 - 15).
Seng the Squelch Level
The MHS335BT recognizes signals as transmissions if they exceed a signal strength
threshold. Adjusting the squelch sets this threshold level. Increasing squelch requires a
signal to be stronger to be seen as a transmission. If you set the squelch too high, you
will risk not receiving transmissions that are lower than that threshold. Reducing the
squelch allows weaker signals to be accepted. However, if you lower the squelch too
much, you will hear white noise all the time.
The squelch feature reduces static on the speaker by ltering out any background
channel noise. At the lowest squelch level, the speaker plays all signals, including any
channel noise. Setting the squelch level higher lters out noise and lets only actual radio
transmissions through.
While listening to a channel, press and hold VOL/SQ to enter Squelch Setting mode. Press
▲ to increase the volume or ▼ to decrease it (Squelch levels = 0 - 15). The following
graphic shows squelch set high enough that only the strongest signals get through.
NOTE: Seng the squelch level too high may prevent you from hearing weaker transmissions. If
you are having diculty hearing a transmission, try seng the squelch level lower.
STRONG SIG.
MEDIUM SIG.
WEAK SIG.
OPEN
E-26
Uniden MHS335 Radio Owner’s Manual
Seng the UIC Channel Mode (USA/CAN/INTL)
You can select marine channels for the USA, Canada, or International waters.
1. Press MENU, then select RADIO SETUP
/Channel Mode
. The
Channel Mode
menu
displays.
2. Select
USA
,
CAN
, or
INTL
and press the
Select
soft key. The RADIO SETUP screen
displays again.
3. Press CLR to return to the Idle screen.
Seng Key Lock
You can lock the keypad through pressing and holding the /LOCK
key
.
KEYLOCK ON
displays if you press a key while keylock is on. Unlock it by pressing and holding the /
LOCK
key again
.
UNLOCK
displays.
NOTE: Key Lock does not aect PTT or the Distress key. If DISTRESS is pressed, Key Lock turns
o and
KEYLOCK
displays.
Seng WX Alert Mode
1. Press
MENU
,
then
select
RADIO SETUP
/Weather Radio.
2. Select
WX Alert
. The
WX Alert
screen displays with the options to turn this alert on
or off.
3. Select
ON
. The
Weather Radio
screen displays again.
4. Select
Back
to return to the RADIO SETUP screen.
5. Turn WX Alert off through these same menus.
Seng FIPS Codes
FIPS codes identify counties in the United States. FIPS codes allow you to receive only the
Specic Area Message Encoding (S.A.M.E.) alert occurring in a specic area. You can enter
a maximum of 30 FIPS codes.
NOTE: For USA FIPS codes by state, see hp://www.nws.noaa.gov/mirs/public/prods/maps/cnty_
ps_list.htm. For Canadian FIPS codes, see hps://www.ec.gc.ca/meteo-weather/default.
asp?lang=En&n=E5A4F19C-1.
1. Press MENU then select RADIO SETUP
/Weather Radio/S.A.M.E FIPS Code
.
2. Select
Add
. The
Add FIPS Code
screen displays.
3. Enter the FIPS codes for your area (nd them on the websites mentioned previously)
and select
STORE
. The S
.A.M.E.FIPS Code
screen displays again.
Edit and delete FIPS codes in a similar manner.
Adjusng the Backlight
The backlight LCD function can be set to automatically dim after a set time.
1. Press MENU then select
General Setup/Backlight.
The
Backlight
menu displays.
2. Select
Backlight Level
and press ▲ or ▼ to adjust the brightness (Off, 1 - 5).
3. Select
Backlight Timeout
and press ▲ or ▼ to set the length of time the backlight
stays on before turning off:
x5 sec
E-27
Uniden MHS335 Radio Owner’s Manual
x10 sec
x20 sec
x30 sec
xAlways On
4. After selecting the Backlight Timeout, press
SELECT
. The
BACKLIGHT
screen
displays again. Press CLR to return to the Idle screen,
Adjust the LCD Contrast
This feature lets you adjust the LCD’s contrast level.
1. Press MENU then select
General Setup/Contrast.
The
Contrast
screen displays.
2. Press ▲ or ▼ to select a contrast level (1 - 8, Default = 4) then press
SELECT
. The
GENERAL SETUP
screen displays again.
3. Press CLR to return to the Idle screen.
Turning the Key Beep On and O
Key beep is the tone that sounds when you press a key.
1. Press MENU then select
General Setup/Key Beep.
The
Key Beep
menu displays.
2. Select
On (Default)
or
Off
. The
GENERAL SETUP
screen displays again.
3. Press CLR to return to the Idle screen.
OPERATING THE RADIO
Making a Transmission
Select the channel you want to transmit on, then press and hold the Push-to-Talk key.
Begin talking. Release the Push-to-Talk key when you’re nished talking to let the other
party respond.
xTo prevent stuck microphone problems or situations where the Push-to-Talk
key is pushed accidentally, the radio limits your talk time to 5 minutes in a single
transmission.
xFor the best sound quality, hold the microphone about two inches away from your
mouth.
Changing the transmission level
In most situations, 1W transmission power is all you need. If you nd yourself far away
from other ships and have trouble getting a response, you may need to increase the
transmission power.
To increase the transmission power in increments:
1. Select the channel you want to transmit on.
2. Press the
HILO
soft key.to change the TX output power from 1W to 6W to 2.5W, then
back again to 1W.
3.
1W
,
6W
, or
2.5W
displays. The transmit power remains at the new setting on that
channel until you change it again.
NOTE: If you try to change transmission power output but the channel is only 1W, the radio
sounds an error tone and stays at 1W.
Some channels (for example, channels 13 and 67) limit the transmission power to 1W.
E-28
Uniden MHS335 Radio Owner’s Manual
When you tune to a limited-power channel, the radio automatically switches to 1W.
Changing the Channel
Press the ▲ or ▼ keys briey to scroll through the channels one channel at a time. Press
and hold the ▲ or ▼ keys to quickly scroll through the channels.
Saving the Channel into Memory
1. When you are on a channel you want to save to memory, press ◄ or ► to scroll
through the soft keys until you nd the
MEM
soft key.
2. Press the
MEM
soft key. The channel you are on is saved to memory and the MEM
icon displays
3. Press the
MEM
soft key when you are on a saved channel to delete that channel
from memory.
Using the LED Light
This feature turns on an LED light. If you press LOCK twice, the radio turns on the
high-intensity LED strobe on your radio. The LED ashes “S O S” in international Morse
Code.
NOTE: Your radio operates normally when the SOS strobe is acvated.
1. Press LOCK once. Turns LCD backlight on.
2. Press LOCK again (twice). The LED turns on like a ashlight.
3. Press LOCK again (three times). The LED blinks in a Morse code SOS pattern.
4. Press LOCK again (four times). The LED goes off.

WHAT IS DSC?
Digital Selective Calling (DSC) is a standard that allows you to call other ships using their
unique identication code (the Maritime Mobile Service Identity or MMSI number), just
like you would call a phone number. To call another station, just enter that station’s MMSI
number and choose the voice channel you want to talk on. The radio uses channel 70 to
transmit your MMSI number to the other station along with the voice channel you requested.
If the other station accepts your call, both radios automatically switch to the requested voice
channel so you can talk to the other station.
DSC provides a system for automated distress calls. At the touch of a key, the radio can
transmit your MMSI number, the nature of your distress, and your current position based on
data from your GPS receiver. The radio repeats the distress call every few minutes until it
receives an acknowledgement.
The DSC standard dedicates a VHF channel—channel 70—to digital transmissions only.
Since digital transmissions require less bandwidth voice transmissions, channel 70 avoids
the problems of busy voice channels.
MMSI NUMBERS
In order to use DSC features, you must be assigned an individual User MMSI number and
program that number into your radio.
You can get more information on MMSI numbers at these resources:
E-29
Uniden MHS335 Radio Owner’s Manual
xThe dealer where you purchased the radio
xRecreational boaters can obtain an individual MMSI number from the Boat Owner’s
Association of the U.S. (http://www.boatus.com/mmsi/ or call 800-563-1536) or Sea
Tow Services International (http://seatow.com/boating_safety/mmsi.asp)
xCommercial boaters need a ship station license to get an MMSI number. For more
information, visit the Federal Communications Commission (FCC) website at http://
wireless.fcc.gov/marine/ fctsht14.html.
Entering MMSI Numbers
When you turn your MHS335BT on for the rst time, you have the option of entering your
MMSI number at that point. If you choose not to enter your MMSI number then, you will still
be able to use your radio; however, you will not be able to use any DSC features.
ENTERING YOUR USER MMSI NUMBER
NOTE: Be sure you have the correct User MMSI number before entering it in the radio. The radio
only allows you to enter the User MMSI once. If you need to re-enter the User MMSI number,
visit www.uniden.com for assistance.
1. Press MENU then select
DSC SETUP/Enter Radio MMSI
. The
Enter MMSI Number
screen displays.
2. Enter the MMSI number using the ▲ and ▼ keys. Select
Next
to enter the MMSI
number again to confirm.
3. Press
FINISH
to save the MMSI number. The radio displays the Idle screen.
USING THE DIRECTORIES
The directories lets you store up to 80 individual MMSI numbers of other ships and 20
group MMSI numbers. From the directories, you can add, edit or delete MMSI numbers.
Individual Directory
ADD
1. Press MENU then select
DSC SETUP/Individual Directory/Add
. The
Individual DIR
screen displays.
2. Select
NAME
and press
Select
.
3. A pop-up keyboard displays (see page E-8). Use the directional arrows to navigate
through the keyboard. Press
SELECT
after each letter.
When the name is complete, press
CONFIRM
. The
INDIVIDUAL DIR screen displays
again.
Select
MMSI
and press
Select.
4. Use ▲ and ▼ to enter the MMSI number. When the ninth digit is correct, press
SAVE
.
5. The radio displays the new MMSI number and name and asks you to conrm. To
save this MMSI number and name, press
Select
. To cancel this MMSI number entry,
press
Delete
.
EDIT
1. Press MENU then select
DSC SETUP/Individual Directory/EDIT
. The
Individual DIR
screen displays with a list of all the names entered into the directory.
E-30
Uniden MHS335 Radio Owner’s Manual
2. Select a name
and press
SELECT
.
3. The name and MMSI number display. Select which item you want to edit and press
SELECT
.
4. Either a popup keyboard displays to edit the name or the MMSI number displays.
When you've nished editing, save your edits.
DELETE
1. Press MENU then select
DSC SETUP/Individual Directory/DELETE
. The
Individual DIR
screen displays a list of all the names entered into the directory.
2. Select a name
and press
SELECT
.
3. The entry is deleted.
Group Directory
ADD
Unlike the user MMSI number, you don't have to get a group MMSI number from a specic
organization. The rst digit of a group MMSI is xed at “0;” otherwise, you can create a
number yourself. (If you are part of a boating club, for example, your club's leadership may
have a list of approved group MMSI numbers to use.) You can also change the group MMSI
number as often as you want.
1. Press MENU then select
DSC SETUP/Group Directory/Add
. The
Group Dir
screen
displays.
2. Select
ADD
.Enter the group name and the Group MMSI number. Group MMSI
numbers always start with a 0, so that digit is already entered for you.
3. Press
Select
. The radio asks you to conrm.
4. To save this MMSI number, press
Select
. To cancel this MMSI number, press
Delete
.
EDIT
1. Press MENU then select
DSC SETUP/Group Directory/EDIT
. The
Group DIR
screen
displays with a list of all the groups entered into the directory.
2. Select a group
and press
SELECT
.
3. The group's name and MMSI number display. Select which item you want to edit and
press
SELECT
.
4. Either a popup keyboard displays to edit the group name or the MMSI number
displays. When you've nished editing, save your edits.
DELETE
1. Press MENU then select
DSC SETUP/Group Directory/DELETE
. The
Group DIR
screen displays a list of all the groups entered into the directory.
2. Select a group name
and press
SELECT
.
3. The group entry is deleted.
MAKING DSC CALLS
There are essentially four different types of DSC voice calls:
E-31
Uniden MHS335 Radio Owner’s Manual
Call type What it does When to use it
Distress Alerts all ships that you need
assistance and sends them your
current position.
In an emergency only.
Individual Calls a single station using the User
MMSI.
When you want to talk to
another station.
Group Calls all the ships that have the same
Group MMSI as yours.
Any time you want to talk
with the whole group you are
traveling with at the same time.
All Ships Calls all ships within range of your
radio.
Safety warnings (e.g., debris
in the water) or any urgent
situation.
Suppose you are coordinating safety for a sailboat race. Before the race starts, you instruct
all the racers to enter your group MMSI number into their radios. During the race:
xThroughout the race, you use group calling to update the racers on the time, race
status, and any course corrections.
xA power boat full of spectators comes too close to the race path. You use individual
calling to contact the power boat and advise them to stay clear of the race.
xYou see a rowboat entering the area, but since it doesn’t have a radio, you can’t
communicate with the rowboat. You use all ships calling to alert all the other ships in
the area of the possible danger.
All ships call
Group
call
Individual
call
All ships call
E-32
Uniden MHS335 Radio Owner’s Manual
Calling a single staon (Individual Call)
To call a single station with DSC, follow these steps:
1. Scroll thorugh soft keys to select
CALL
soft key.
CALL
menu displays.
2. The radio displays the ships listed in your Individual Directory (see page E-29).
Select the ship you want to call and press
SELECT.
3. The radio displays the ship you selected to transmit to and the transmission channel.
Select
SEND
.
4. The radio displays the ship called and the elapsed time since the call was
transmitted.
5. The radio automatically switches to channel 70 to transmit the call request.
xWhen the other station accepts the call, both radios switch to the selected
response channel for voice transmission.
xIf the other station did not respond on the channel you selected, you can select
RESEND
or
BACK
.
Calling a parcular group of ships (Group Call)
Group calling calls all the ships that share your group MMSI. You must have a group MMSI
programmed into the radio to make a group call, and the ships you are calling must have
this same group MMSI programmed into their radios in the GROUP Directory (see page
E-30).
1. Scroll thorugh soft keys to select
CALL
soft key.
CALL
menu displays.
2. Select
Group Call.
3. A list of groups displays (see page E-30 to create groups). Press ▲ and ▼ to scroll
through the list and select the group to call.
4. The next
Group Call
screen shows the group and what channel you're transmitting
to. After selecting
SEND
, the radio switches to channel 70 to transmit the call
request and the screen displays a random countdown clock as it waits for an
acknowledgement.
5. After the countdown clock ends, you can either resend the group call, or go back to
the Idle screen, or let the radio generate another countdown clock.
6. After the radio receives an acknowledgement, it automatically switches to the
designated response channel.
Calling all ships (All-Ships Call)
All ships calling contacts all DSC radios within range of your ship. You should only use all
ships calling in the event of a Safety warning (such as debris in the water) or to request
assistance in an Urgency (any situation where your ship has a serious problem but is not
yet in distress).
1. Scroll thorugh soft keys to select
CALL
soft key.
CALL
menu displays.
2. Select
ALL SHIPS
. The
ALL SHIPS CALL
screen displays, showing two options:
SAFETY
and
URGENCY
.
3. Select either option and then enter the channel to transmit on. Select
SEND
.
4. The next screen displays the type of ALL SHIPS CALL sent, the channel the call was
sent on, and a random countdown clock.
E-33
Uniden MHS335 Radio Owner’s Manual
5. After the countdown clock ends, you can either resend the group call, go back to the
Idle screen, or let the radio generate another countdown clock.
6. After the radio receives an acknowledgement, it automatically switches to the
designated response channel.
MAKING AN AUTOMATIC DISTRESS CALL
After you have programmed your MMSI number, your radio can transmit an automated
distress call on channel 16 at 6W with your current location and nature of the distress. The
Distress Alert alarm sounds and the radio then monitors channel 16 for a response and
repeats the distress call every few minutes until it receives an acknowledgement.
1. If you have not already selected a distress message type (see page E-10), go to
MENU/
DISTRESS MESSAGE
. Select the nature of the alert from the list. The screen
returns to the Main menu.
Undesignated Sinking Fire, Explosion Man Overboard
Adrift Flooding Abandoning Ship Capsizing
Collision Piracy Grounding
2. Press and hold the DISTRESS key on the side of the radio for about 3 seconds. The
Distress Alert alarm sounds and the radio acquires GPS location if needed. After 10
seconds, the radio transmits the distress call, starts a random countdown timer, and
waits for an acknowledgement.
3. After the timer counts down, another random countdown timer begins unless you
take action Pause, Cancel, or Manually Resend).
NOTE: If no MMSI number has been programmed, the radio prompts you to enter your MMSI
number.
Canceling an automac distress call
While the radio is waiting for a response, it gives you the option of canceling the call. To
cancel the distress call, press the
CANCEL
soft key. A conrmation screen displays; press
the
YES
soft key.
Resending an automac distress call
Press the
RESEND
soft key.
Receiving an automac distress call acknowledgement
Once you receive an acknowledgement that the distress call was received, you must
manually mute the acknowledgement alarm. Press the
MUTE
soft key.
Receiving a distress call
When you receive a distress call, the Receiving DSC Distress Call alarm sounds. Press
any key to silence the alarm.
NOTE: This radio does not have the ability to acknowledge a distress call. Only the Coast Guard or
an authorized Search and Rescue agency can acknowledge a DSC distress call.
The soft keys change to
QUIT
(return to the Idle screen),
PAUSE
, and INFO (view
E-34
Uniden MHS335 Radio Owner’s Manual
longetude, latitude, and time sent information).
DSC CALLS
Individual DSC Call
If your radio receives an individual DSC call from another station, it sounds an incoming call
alarm and displays the MMSI number of the station calling you.
Press any key to stop the alarm. The soft keys change to
QUIT
(return to the Idle screen),
PAUSE
, and INFO (view longetude, latitude, and time sent information).
1. After you silence the alarm and the soft keys change. press the
PAUSE/CONT
soft
keys. The
INDIVIDUAL RECEIVE
screen displays.
2. This screen displays a channel option. Press the
ABLE
soft key to propose a different
channel or
UNABLE
to send an Unable to Comply message and return to the Idle
screen.
3. After pressing
ABLE
, the
SELECT CHANNEL
screen displays a list of available
channels. Scroll to one and press
SELECT
.
4. The
INDIVIDUAL RECEIVE
screen displays. Press the
CONT
soft key.
5. The radio sends the
ABLE TO COMPLY
message and switches to the working
channel.
Group DSC Call
If your radio receives a group DSC call from another station, it sounds an incoming group
call alarm and displays the name/MMSI number of the group calling you.
1. Press any key to stop the alarm.
2. The soft keys change to
QUIT
(return to the Idle screen),
PAUSE,
and INFO (view
longetude, latitude, and time sent information). The radio also changes to the
requested working channel.
Answer a DSC Call
1. After you silence the alarm and the soft keys change. press the
PAUSE then CONT
soft keys. The
INDIVIDUAL RECEIVE
screen displays.
2. This screen displays a channel option. Press the
ABLE
soft key to propose a different
channel or
UNABLE
to send an Unable to Comply message and return to the Idle
screen.
3. After pressing
ABLE
, the
SELECT CHANNEL
screen displays a list of available
channels. Scroll to one and press
SELECT
.
4. The
INDIVIDUAL RECEIVE
screen displays. Press the
CONT
soft key.
5. The radio sends the ABLE TO COMPLY message and switches to the working
channel.
DSC Call Logs
Your radio keeps track of the calls you send and receive. The DSC logs are useful if you
have been off your ship or away from your radio and want to see who has tried to contact
you. The radio displays the last 50 transmitted calls and the last 50 received calls that it
received. If you have unread incoming DSC calls, the radio displays a Message icon. When
you display all Distress and Other receiving logs, the message icon disappears.
E-35
Uniden MHS335 Radio Owner’s Manual
1. Select the
CALL
soft key, then the
DSC LOG
. Three call logs display:
TRANSMITTED
LOG
,
RECEIVED LOG
, and
DELETE LOG
.
2. Select
TRANSMITTED LOG
to see the last 50 transmitted calls transmitted by the
radio. Select
RECEIVED LOG
to see the last 50 received calls received by the radio.
Select
DELETE LOG
to delete entries in a specic log.
3. Calls are listed in the order they were received, with the newest call shown rst. The
display blinks if there are new calls you have not reviewed. The
Message
icon also
displays.
4. Select the call you want to see the details of and use ▲ and ▼ to see all of the
information for that call. The log displays different information depending on type of
call received.
DSC Call Type Receive Log Information
Distress MMSI (or name), position, time, nature code.
Distress
Acknowledge
MMSI (or name), distress MMSI, position, time, nature code.
All Ships MMSI (or name), category code, communication channel
number.
Group MMSI (or name), category code, communication channel
number.
Individual MMSI (or name), category code, communication channel
number.
Individual
Acknowledge
MMSI (or name), Completed/Unattended, category code,
communication channel number.
Test MMSI (or name), category code.
Test Acknowledge MMSI (or name), category code.
Pos Reply MMSI (or name), position, time, category code.
Pos Request MMSI (or name), category code.
Pos Send MMSI (or name), position, time, category code.
5. From the log menu, select
Exit
to close the
RECEIVE LOG
and return to the previous
mode.
Making or Returning a Call
1. From the
CALL
soft key, select
DSC LOG
.
2. Select either
TRANSMITTED LOG
or
RECEIVED LOG
. A list of calls displays.
3. Scroll up or down to select a call. The
VIEW LOG
displays the dall details.
4. Select
CALL
from the
VIEW LOG
soft keys.
E-36
Uniden MHS335 Radio Owner’s Manual
TEST CALLS
Making Test Calls (Test)
NOTE: You can use the test call feature to make sure your radio is working and congured
correctly. To avoid overloading coastal receiving staons, you should limit test calls to these
staons to once a week.
NOTE: Many coastal staons have specic frequencies and MMSI numbers you should use
for making test calls. Before making a test call to a coastal staon, be sure to check the Local
Noce to Mariners (LNM), issued every week by the US Coast Guard. The LNMs for each
region are available online at hp://www.navcen.uscg.gov/?pageName=lnmMain.
1. Select
CALL
from the soft keys.The
CALL
screen displays.
2. Scroll to
TEST CALL
and press
SELECT.
The list of ships from the Individual
Directory displays.
3. Select a ship. The next screen,
Test call
, displays the name of the ship you just
selected; press
SEND
.
4. A
Waiting for ACK
message displays on the
Test call
screen.
5. If you do not receive an acknowledgement, either resend the transmission or select
BACK
to return to the Idle screen.
Receiving Test Call Setup
When another station sends you a test call, you can select options to answer the test call
manually or have the radio answer automatically.
1. Press MENU to display the menu options.
2. Select
DSC SETUP/Test Call Ack
and press
SELECT
.
3. Press
Auto
for the radio to automatically send an acknowledgement when it receives
a test call. Press
Manual
to answer the call manually.
4. The screen returns to the
DSC SETUP
menu.

Enabling Automac Posion Reply
If you want the radio to automatically transmit your current position whenever it receives a
position request, you can enable automatic position reply. Most boaters activate automatic
position reply for safety reasons or because they subscribe to a marine towing service.
Sometimes—for example, in some competitive situations--you may not want other ships to
get your position without your manual conrmation.
1. Press MENU then select
DSC SETUP/Auto ACK
. The screen displays
Individual ACK
and
Position ACK options.
2. Select either
Auto
or
Manual
for either option and then press
Select
.
POS Request
Any time you need to know where another ship currently is—to nd your boating partners,
to respond to a request for assistance, etc.—you can send a position request to their radio:
1. Select
CALL
soft key. The
CALL
screen displays.
2. Select
POSITION REQUEST
. The
POSITION REQUEST
screen displays the list of
ships you entered into the Individual directory.
E-37
Uniden MHS335 Radio Owner’s Manual
3. Select a ship and press SELECT. A Position Request screen displays for
conrmation. Press SEND.
4. The radio sends out a position request to that ship and waits for acknowledgement.
5. If you do not receive an acknowledgement, select
BACK
to return to the Idle screen.
Posion Send
If you are requesting assistance, using an all ships call to give a safety warning, or have
received a Position Request, you can send your current position so other ships know where
you are:
1. Press
CALL
soft key. The
CALL
screen displays.
2. Select
POSITION SEND
.
3. The radio displays the names listed in your directory; use ▲and ▼ to choose the
ship you want to contact and press
SELECT
. If you want to contact a station that is
not in your directory, select
Manual
.
4. The radio prompts you to enter the MMSI number you want to call. Enter the MMSI
number the same way you enter directory entries (see page 22). Enter all nine digits
and press
SELECT
.
5. The radio displays the name and MMSI number of the station you are about to
contact along with your current position information.Select
Send
. To cancel the
transmission, select
Exit
.
6. The radio transmits your current position information to the other station.
DISABLING AUTOMATIC CHANNEL SWITCHING
If you are involved in a bridge-to-bridge call, you may not want the radio to automatically
switch channels when it receives a DSC call. In cases like this, you can disable automatic
channel switching. If you receive an individual call, the radio will respond with an
unattended code, just as if the radio were in Standby.
1. Press MENU and then select
DSC SETUP
/
Auto Channel Switch.
2. The
Auto Channel Switch
screen displays, giving you the option to
Accept
DSC calls
when they come in (default),
Ignore
DSC calls, or make a
Manual
decision for each
incoming call. When you have selected an option, the radio returns to the DSC
SETUP
screen.
NOTE: Use this feature with cauon. Deacvang automac switching and then forgeng it can
make it hard for you to receive DSC calls.
If you have unread incoming DSC calls, the radio displays a message icon. You can review
who has called through the DSC logs. The radio displays the last 50 transmitted calls and
the last 50 received calls (see page E-34).
GPS FEATURES
GPS OPERATION OVERVIEW
Your GPS system provides more than just your specic location. The
MOB
(Man
Overboard) soft key (see page E-14) lets you immediately save your current position so
rescuers can converge on that exact man overboard location. The
Favorites
menus let you
create a directory of favorite places and their coordinates so you can easily return there.
E-38
Uniden MHS335 Radio Owner’s Manual
Using the GPS setup menus, you can determine power-saving options, measurement
increments, and time settings.
The radio is factory-preset to search for your geographic location when it is turned on for
the rst time.
GPS MENU
The GPS menu options are:
MENU OPTION DESCRIPTION
Current Position Displays the following:
- Latitude
- Longetude
- Time
- Speed Over Ground (SOG)
- Course Over Ground (COG)
GPS Signal Coverage Displays latitude, longitude, and time as well as a map of
active satellites within range. (Active satellites display as
black dots; inactive satellites display as white dots.)
GPS Satellite Signal Displays a list of satellite numbers and signal strength.
Battery Save Select what percentage of your battery power should be
saved.
- Auto (Default - the radio decides how to reserve power (for
example, mimimize background tasks/checks)
- 40%
- 50%
- 70%
- 90%
Time Offset Select length of time (in half-hour increments) to offset the
time set on the radio.
Time Display Area: Choose between local time or UTC (UCT/GMT)
Format: Choose 12-hour or 24-hour style
Daylight Set Daylight Savings Time: On/Off
Direction Choose Course Up (oriented by your course direction) or
North Up (oriented to compass north).
Location Accuracy Location in degrees (DDD), minutes (mm), and seconds (ss).
D-GPS D-GPS is a means of correcting GPS variances. Turn D-GPS
off in the southern hemisphere.
E-39
Uniden MHS335 Radio Owner’s Manual
MENU OPTION DESCRIPTION
Units of Measure Set Speed (Knots, MPH, or KM/H), Distance (Nautical Mile,
Staute Mile, or Kilometer), or Altitude (Feet or Meter) as the
radio's unit of measure.
NMEA Output Select the NMEA output (see page E-39).
Stationary Position Turn stationary positioning on or off.
Bread Crumbs Bread crumbs are GPS measurements recorded in specic
intervals. These bread crumbs can help you "retrace" your trip
from one spot to another. Select the length of time you want
between bread crump measurements.
NMEA FEATURES
Your radio supports NMEA 0183 (version 4.10), a standard for data communication between
marine instruments.
NMEA sentences contain different sets of data related to your ship. The MHS335BT
supports the following sentences:
DATA RMC GLL GGA GSV GSA
UTC Time OO O X X
Status (Valid/IInvalid) O O O X X
Latitude/Longitude O O O X X
Speed O X X X X
Course O X X X X
Date O X X X X
X = Data Not Provided
O = Data Provided
Chartploer Connecon
Connect to Chartplotter
E-40
Uniden MHS335 Radio Owner’s Manual
If you have difculty getting your chartplotter to receive data from your radio, check the
chartplotter's conguration. It should be set to the following parameters:
Baud rate 4800 bps
Data bits 8
Parity None
Stop bits 1
Data amplitude Over 3.0 V
Drive capability Over 10 mA
NMEA Output
When the radio receives a DSC call (Distress, Position Reply, or Position Send), it outputs a
DSC/DSE sentences from the NMEA output port in the following formats:
x$CDDSC,12,3081234000,,07,00,0354013946,0657,,,S,E*6D
x$CDDSE,1,1,A,3081234000,00,60875646*13
ADDITIONAL FEATURES
RENAMING CHANNELS
If you discover that a marine radio channel has a different common name in your local area,
you can change the name of that channel to make it easier for you to use (see the channel
lists beginning on page E-44 for the default channel names). To rename a channel, follow
the steps below:
1. Press MENU and select RADIO SETUP
/Channel Name.
The screen displays the list
of channels with their names.
2. Press ▲ or ▼ to select the channel you want to change and then press
RENAME
.
3. A popup keyboard displays. Enter a new name. When you have entered the name,
select
FINISH.
4. The channel list displays again with the new name.
5. When you are satised with the channel list, select CLR
to return to the Idle screen.
UNIDEN MARINE APP
Uniden's Marine Radio app lets you congure your MHS335BT and send text messages
from your mobile device. The app is available for iOS and Android. Go to the Apple App
store, Google Play, or Amazon to download this free app.
MAINTENANCE AND TROUBLESHOOTING
Due to its rugged design, your radio requires very little maintenance. However, it is a
precision electronic instrument, so you should follow a few precautions:
xIf the antenna has been damaged, do not transmit except in an emergency situation.
Doing so may cause further radio damage.
E-41
Uniden MHS335 Radio Owner’s Manual
xYou are responsible for continued FCC technical compliance of your radio.
xArrange for periodic performance checks with your Uniden dealer.
Problem Things to Try
The radio won’t turn on. - Verify that the battery is installed correctly.
- Charge the radio.
The power LED on the
charger doesn’t turn on.
- Don’t use the charger when the ambient temperature is
below 0° C (32° F) or above 45° C (113° F).
- Make sure the charging contacts on the radio and charger
are clean.
- Replace the battery.
The radio won’t transmit.
- Make sure you are not in Weather or Scan mode.
- Make sure you are not trying to transmit on a receive-only
channel or transmit at the wrong power level for this channel
(see the channel lists starting on page E-44.
- Check the battery power level; if it’s low, charge the battery
before trying to transmit.
- Make sure the duration of each transmission is less than 5
minutes.
- Try transmitting on a different channel.
I can’t hear anything from
the speaker.
- Adjust the squelch level; it is probably too high.
- Adjust the volume level; it is probably too low.
- If the radio has been exposed to water, there may be water
on the speaker. Remove the water and allow the radio to
dry out.
Noise comes out of the
speaker all the time Adjust the squelch level; it is probably too low.
I can transmit, but no one
can hear me.
Check your UIC channel settings: does the area you are in use
different channel assignments?
I’m not getting hazard
alerts. Make sure Weather Alert Watch is turned on.
The display ashes, and I
don’t know why.
The channel number on the display will ash if the radio is
in a Watch mode or in Scan mode. Try turning off scanning,
Weather Alert Watch, Triple Watch, or Dual Watch beginning
on Page E-20.
Scan won’t start. Be sure you have channels saved into Favorites.
No beeps sound. Key beep is set to OFF. Turn Key Beep on.
I cannot send DSC calls. - Make sure the MMSI (DSC self ID) is entered.
- Turn ON the DSC Switch in the menus.
I cannot receive GPS
position data.
Reposition the radio so that nothing blocks the antenna from
the satellite signal.
Where can I nd my
radio’s serial number? The serial number is on a plate inside the battery compartment.
E-42
Uniden MHS335 Radio Owner’s Manual
Problem Things to Try
When I turn on the radio,
I get a message that
"positioning data is not
acquired."
Be sure there are no obstructions between the radio's antenna
and the sky. If you are inside the cabin, move outside.
SPECIFICATIONS
General
Channels
All US/International/Canada marine channels
10 Weather channels
Freq. Control PLL
Freq. Tol. Transmit: 1.5 PPM (at 77°F/25°C)
Receive: 1.5 PPM (at 77°F/25°C)
Oper. Temp. -4°F (-20°C) to +122°F(+50°C)
Antenna Flexible Whip
Microphone Built-in Electret type
Display Liquid Crystal Display
Speaker 16Ω 1.0 W
Power Source Rechargeable Lithium Ion Battery
7.4V 1800 mAh
Size (without antenna, and belt
clip)
6.122 (H) x 2.562 (W) x 1.633 (D) inch
155.5 (H) x 65.1 (W) x 41.5 (D) mm
Size (with antenna and belt clip) 11.791 (H) x 2.562 (W) x 2.173 (D) inch
299.5 (H) x 65.1 (W) x 55.2 (D) mm
Weight (without battery, antenna,
and belt clip) 6.673 oz (189.2g)
Weight (with battery, antenna,
and belt clip) 10.945 oz (310.3g)
Battery Weight 3.135 oz (88.9g)
Antenna Weight 0.686 oz (19.46g)
Belt Clip Weight 0.449 oz (12.75g)
Transmitter
Frequency Range 156~158 MHz
Frequency Stability ±2.5 PPM max
Power Output 1W, 2.5W, and 6W
Spurious Emissions -30 dBm @ HI; -30 dBm @ LO (nominal)
Current Drain 1.5 A (6W)
E-43
Uniden MHS335 Radio Owner’s Manual
Receiver
Type Double Conversion Super Heterodyne
Phase Locked Loop system for Local Oscillator
Frequency Range 156~164 MHz
Sensitivity 0.24 μV for 12dB SINAD
Squelch Sensitivity Threshold 0.2μV
Audio Frequency Response +5.5 dB @ 500 Hz; -6 dB @ 2000Hz
Adjacent Channel Selectivity 73 dB @ ±25 kHz
Audio Output Power ≥0.8 W @MAX VOLUME
Current Drain Squelched: 90mA; Max. Audio: 350mA
REFERENCE TABLES
Channel Descripons and What They Mean
The table below lists the display name or channel description used in the following tables
and what each description means.
Channel name/description Used for
DISTRESS SAFETY AND CALLING primarily emergency messages and distress
calls
INTERSHIP SAFETY safety messages from one ship to another, or
from a ship to Coast Guard aircraft
NON-COMMERCIAL (recreational or
voluntary ships only)
messages about the needs of the ship, including
shing reports, rendezvous, scheduling repairs
and berthing information
COMMERCIAL (working ships only) messages about the needs of the ship or the
business the ship is engaged in
PUBLIC CORRESPONDENCE/
MARINE OPERATOR
calls to the marine operator at a public coast
station. Marine operators can connect you to the
telephone network so you can make and receive
calls. (There is usually a charge for this service.)
PORT OPERATIONS/VTS (ship trafc
system)
messages about the movement and safety of
ships in or near ports, locks or waterways. In
certain major ports, some channels may be
restricted to specic types of port operations
messages.
NAVIGATIONAL/BRIDGE TO
BRIDGE
messages about ship navigation, for example,
passing or meeting other ships, maneuvering
through locks, or navigating around drawbridges.
Messages must be short!
E-44 Uniden MHS335 Radio Owner’s Manual
Channel name/description Used for
STATE CONTROL
messages about government regulation
boating activities, or assistance to ships;
also used to talk to ships and coastal stations
operated by state or local governments
DIGITAL SELECTIVE CALLING DSC signals only (no voice communications
allowed at any time)
MARINE RADIO CHANNEL CHART
Ch
No. USA INT CAN TX RX Channel Type/Name
01 x x 156.050 160.650 Public Correspondence (Marine
Operator)
01A* x 156.050 156.050
Port Operation and Commercial
some areas.
02 x x 156.100 160.700 Public Correspondence (Marine
Operator)
03 x x 156.150 160.750 Public Correspondence (Marine
Operator)
04 x 156.200 160.800 Public Correspondence (Marine
Operator)
04A x 156.200 156.200 Canadian Coast Guard: West Coast
Commercial Fishing: East Coast
05 x 156.250 160.850
Public Correspondence (Marine
Operator). Ship Movement, Port
Operations
05A x x 156.250 156.250 Port Operations, Ship Movement,
VTS in some areas
06 x x x 156.300 156.300 Inter-ship safety
07 x 156.350 160.950 Public Correspondence (Marine
Operator)
7A x x 156.350 156.350 Commercial
08 x x x 156.400 156.400 Commercial (Inter-Ship Only)
09 x x x 156.450 156.450 Boater Calling, Commercial and
Non-Commercial
10 x x x 156.500 156.500 Commercial
11 x x x 156.550 156.550 Commercial, VTS in selected areas
E-45
Uniden MHS335 Radio Owner’s Manual
Ch
No. USA INT CAN TX RX Channel Type/Name
12 x x x 156.600 156.600 Port Operations, VTS in selected
areas
13 x x x 156.650 156.650
Intership Navigation Safety (Bridge-
to-Bridge). Ships >20m length
maintain a listening watch on this
channel in US waters.
14 x x x 156.700 156.700 Port Operation, VTS in some areas
15 x Inhibit 156.750 Environmental (Receive Only)
15 x x 156.750 156.750
Inter-ship, Port Operations,
Commercial, Non-Commercial, Ship
Movement (1 Watt Only)
16 x x x 156.800 156.800 Distress, Safety, Calling
17 x x x 156.850 156.850 State and Local Govt Maritime
Control (1 Watt Only)
18 x 156.900 161.500 Port Operations, Ship Movement
18A x x 156.900 156.900 Commercial
Canada: Towing West Coast
19 x 156.950 161.550 Commercial
19A x x 156.950 156.950 Commercial
20 x x x 157.000 161.600 Port Operations
Canada: 1 Watt Only
20A x 157.000 157.000 Port Operation
21 x 157.050 161.650 Port Operations
21A x x 157.050 157.050 Coast Guard Only
21B x INHIBIT 161.650 Canadian CG Continuous Marine
Broadcast (CMB) Service
22 x 157.100 161.700 Port Operations, Ship Movement
22A x x 157.100 157.100
US and Canadian Coast Guard
Liaison and Airtime Safety
Information Broadcasts Announced
on Channel 16
23 x x 157.150 161.750 Public Correspondence (Marine
Operator)
23A x 157.150 157.150 US Coast Guard Only
E-46
Uniden MHS335 Radio Owner’s Manual
Ch
No. USA INT CAN TX RX Channel Type/Name
23B x INHIBIT 161.750 Canadian CG Continuous Marine
Broadcast (CMB Service
24 x x x 157.200 161.800 Public Correspondence (Marine
Operator)
25 x x x 157.250 161.850 Public Correspondence (Marine
Operator)
25B x INHIBIT 161.850 Canadian CG Continuous Marine
Broadcast (CMB) Service
26 x x x 157.300 161.900 Public Correspondence (Marine
Operator)
27 x x x 157.350 161.950 Public Correspondence (Marine
Operator)
28 x x x 157.400 162.000 Public Correspondence (Marine
Operator)
28B x INHIBIT 162.000 Canadian CG Continuous Marine
Broadcast (CMB) Service
60 x x 156.025 160.625 Public Correspondence (Marine
Operator)
61 x 156.075 160.675 Public Correspondence (Marine
Operator)
61A x 156.075 156.075 Canadian Coast Guard: West Coast
Commercial Fishing: East Coast
62 x 156.125 160.725 Public Correspondence (Marine
Operator)
62A x 156.125 156.125 Canadian Coast Guard
63 x 156.175 160.775 Public Correspondence (Marine
Operator)
63A x x 156.175 156.175 VTS, Port Operations
64 x x 156.225 160.825 Public Correspondence (Marine
Operator)
64A x 156.225 156.225 Canada: Commercial Fishing Only
65 x 156.275 160.875 Public Correspondence (Marine
Operator)
65A x x 156.275 156.275 Port Operations
Canada: Towing West Coast
66 x 156.325 160.925 Public Correspondence (Marine
Operator)
E-47
Uniden MHS335 Radio Owner’s Manual
Ch
No. USA INT CAN TX RX Channel Type/Name
66A x x 156.325 156.325 Port Operations
Canada: 1 Watt Only
67 x x x 156.375 156.375
US: Commercial, Bridge-to-Bridge,
VTS in some areas
Canada: Search and Rescue,
Commercial in some areas, Non-
Commercial on West Coast
68 x x x 156.425 156.425 Non -Cmmercial
69 x x x 156.475 156.475
Non-Commercial
Canada: Commercial East Coast.
Non-Commercial West Coast
70 x x x 156.525 156.525 DSC (Digital Selective Calling) Only.
No Voice Communications Allowed
71 x x x 156.575 156.575
US: Non-Commercial
Canada: Ship Movement West
Coast, Non-Commercial East Coast
72 x x x 156.625 156.625 Non-Commercial (Ship-to-Ship)
73 x x x 156.675 156.675 Port Operations
74 x x x 156.725 156.725 Port Operations
75 x x x 156.775 156.775 Port Operations (1 Watt Only)
76 x x x 156.825 156.825 Port Operations (1 Watt Only)
77 x x x 156.875 156.875 Port Operations (Ship-to-Ship)
78 x 156.925 161.525 Port Operations
78A x x 156.925 156.925 Non-Commercial, Inter-Ship
79 x 156.975 161.575 Port Operations
79A x x 156.9750 156.975 Commercial, Inter-Ship
80 x 157.025 161.625 Port Operationsx
80A x x 157.025 157.025 Commercial, Inter-Ship
81 x 157.075 161.675 Port Operations
81A x x 157.075 157.075 Government, Canadian Coast Guard
82 x 157.125 161.725 Port Operations
82A x x 157.125 157.125 Government, Canadian Coast Guard
83 x 157.175 161.775 Port Operations
83A x x 157.175 157.175 Coast Guard
E-48
Uniden MHS335 Radio Owner’s Manual
Ch
No. USA INT CAN TX RX Channel Type/Name
83B x INHIBIT 161.775 Canadian CG Continuous Marine
Broadcast (CMB) Service
84 x x x 157.225 161.825 Public Correspondence (Marine
Operator)
85 x x x 157.275 161.875 Public Correspondence (Marine
Operator)
86 x x x 157.325 161.925 Public Correspondence (Marine
Operator)
87 x x x 157.375 157.375 Public Correspondence (Marine
Operator)
88 x x x 157.425 157.425 Public Correspondence (Marine
Operator)
1019 x x 156.950 156.950 Commercial
1020 x x 157.000 157.000 Port Operations
1078 x x 156.925 156.925 Non-Commercial, Inter-Ship
1079 x x 156.975 156.975 Commercial, Inter-Ship
2019 x 161.550 161.550 Commercial
2020 x 161.600 161.600 Port Operations
2078 x 161.525 161.525 Port Operations
2079 x 161.575 161.575 Port Operations

Ch No. RX Freq Name on display
WX01 162.5500 162.550 MHz
WX02 162.4000 162.400 MHz
WX03 162.4750 162.475 MHz
WX04 162.4250 162.425 MHz
WX05 162.4500 162.450 MHz
WX06 162.5000 162.500 MHz
WX07 162.5250 162.525 MHz
WX08 161.6500 161.650 MHz
WX09 161.7750 161.775 MHz
WX10 163.2750 163.275 MHz
E-49
Uniden MHS335 Radio Owner’s Manual

Types of Events
xA WARNING is an event that alone poses a signicant threat to public safety and/or
property, probability of occurrence and location is high, and the onset time is relatively
short.
xA WATCH meets the classication of a warning, but either the onset time, probability
of occurrance, or location is uncertain.
xAn EMERGENCY is an event that, by itself, would not kill or injure or do property
damage, but indirectly may cause other things to happen that result in a hazard. For
example, a major power or telephone loss in a large city alone is not a direct hazard,
but disruption to other critical services could create a variety of conditions that could
directly threaten public safety.
xA STATEMENT is a message containing follow up information to a warning, watch, or
emergency.
Event SAME Code Type
Blizzard Warning BZW Warning
Coastal Flood Watch CFA Watch
Coastal Flood Warning CFW Warning
Dust Storm Warning DSW Warning
Flash Flood Watch FFA Watch
Flash Flood Warning FFW Warning
Flash Flood Statement FFS Statement
Flood Watch FLA Watch
Flood Warning FLW Warning
Flood Statement FLS Statement
High Wind Watch HWA Watch
High Wind Warning HWW Warning
Hurricane Watch HUA Watch
Hurricane Warning HUW Warning
Hurricane Statement HLS Statement
Severe Thunderstorm Watch SVA Watch
Severe Thunderstorm
Warning SVR Warning
Severe Weather Statement SVS Statement
Special Marine Warning SMW Warning
Special Weather Statement SPS Statement
Tornado Watch TOA Watch
Tornado Warning TOR Warning
E-50
Uniden MHS335 Radio Owner’s Manual
Event SAME Code Type
Tropical Storm Watch TRA Watch
Tropical Storm Warning TRW Warning
Tsunami Watch TSA Watch
Tsunami Warning TSW Warning
Winter Storm Watch WSA Watch
Winter Storm Warning WSW Warning
Avalanche Watch AVA Watch
Avalanche Warning AVW Warning
Child Abduction Emergency CAE Emergency
Civil Danger Warning CDW Warning
Civil Emergency Message CEM Emergency
Earthquake Warning EQW Warning
Evacuation Immediate EVI Warning
Fire Warning FRW Warning
Hazardous Materials Warning HMW Warning
Law Enforcement Warning LEW Warning
Local Area Emergency LAE Emergency
911 Telephone Outage
Emergency TOE Emergency
Nuclear Power Plant Warning NUW Warning
Radiological Hazard Warning RHW Warning
Shelter in Place Warning SPW Warning
Volcano Warning VOW Warning
Test Message ADR Test
Practice/Demo Warning DMO Test
Required Monthly Test RMT Test
Required Weekly Test RWT Test
No Response Event Code
TXB Transmitter Backup On
TXF Transmitter Carrier On
TXO Transmitter Carrier On
TXP Transmitter Primary On
E-51Uniden MHS335 Radio Owner’s Manual
REGULATIONS AND SAFETY WARNINGS
MARITIME RADIO SERVICES OPERATION
Warning! This transmitter will operate on channels/frequencies that have restricted use in the
United States. The channel assignments include frequencies assigned for exclusive use of the
U.S. Coast Guard, use in Canada, and use in international waters. Operation on these frequencies
without proper authorization is strictly forbidden. See page E-44 for tables of the available channels
and their uses. If you are still not certain which channels to use, see the FCC maritime radio page at
the FCC website (http://wireless.fcc.gov/marine/) or contact the FCC Call Center at 1-888-CALL-
FCC. For individuals requiring a license, such as commercial users, you should obtain a license
users).FCC/IC Maximun SAR Value (1g): Body: 3.083 W/kg，Face: 3.037 W/kg. CE Maximun
SAR Value (10g): Body: 1.645 W/Kg, Face: 1.630 W/Kg
BASIC RADIO GUIDELINES
You should familiarize yourself with the rules on marine radios and be aware of which rules apply
to your ship. Complete guidelines for all ship and marine radio types can be found at the US Coast
Guard website under the topic Radio Info for Boaters (the direct link is http://www.navcen.uscg.
gov/?pageName=mtBoater. Here are a few guidelines that affect nearly all boaters.
• If you have a VHF radio on your ship, you must maintain a watch on channel 16 (156.800 MHz)
whenever the radio is not being used to communicate. Starting in 2004, if a radio is carried, it
must be on and set to channel 16. Wwhenever your ship is underway.
• If you hear a distress call, wait a few minutes to let a shore station or Coast Guard ship
respond. If no other station has responded after 5 minutes, you must respond to the distress
call.
• Do not make false mayday or distress calls as a prank or to test your radio. (This is essentially
Output Power: 6W
Emission: 16K0F3E
Transmitter Frequency Range: 156.025-157.425 MHz
This device complies with Part 15 of the FCC Rules. Operation is subject to the condition that this
device does not cause harmful interference.
approved by Uniden could void the user’s authority to operate the equipment.
In August 1996 the Federal Communications Commission (FCC) of the United States with its action
in Report and Order FCC 96-326 adopted an updated safety standard for human exposure to radio
frequency electromagnetic energy emitted by FCC regulated transmitters. Those guidelines are
consistent with the safety standard previously set by both U.S. and international standards bodies.
The design of the radio complies with the FCC guidelines and these international standards.
WARNING! Read this information before using the radio.
E-52
Uniden MHS335 Radio Owner’s Manual
Never allow children to operate the radio without adult supervision and the knowledge of the
following guidelines.
WARNING! It is up to the user to properly operate this radio transmitter to insure safe operation.
Please adhere to the following:
Use only the supplied or an approved antenna. Unauthorized antennas, modications, or
attachments could impair call quality, damage the radio, or violate FCC regulations.
Do not use the radio with a damaged antenna. If a damaged antenna comes into contact with the
skin, a minor burn may result. Please contact your local dealer for a replacement antenna.
To maintain compliance with FCC RF exposure requirements, the radio must be used with a
maximum duty cycle not exceeding 50% in a typical push-to-talk radio use time. DO NOT transmit
for more than 50% of total radio use time.

This device was tested for typical body-worn operations using the supplied belt-clip. To maintain
compliance with FCC RF exposure requirements, body-worn operations are restricted to the
supplied belt-clip. For hand-held operation, the radio should be held 1 inch from the user’s face. The
use of accessories that do not satisfy these requirements may not comply with FCC RF exposure
requirements and should be avoided. For more information about RF exposure, please visit the FCC
website at www.fcc.gov.

This equipment contains a rechargeable Lithium Ion battery. The rechargeable Lithium Ion battery
contained in this equipment may explode if disposed of in a re.
Do not short-circuit the battery.
Do not charge the rechargeable battery used in this equipment in any charger other than the one
specied in the owner’s manual. Using another charger may damage the battery or cause the
battery to explode.
NOTE: Li-Ion batteries must be recycled or disposed of properly.
Avoid exposing the battery (whether attached to the radio or not) to direct sunlight, heated cars, or
temperatures below -4°F (-20°C) or above +140°F (+60°C). Exposing the chemical contained within
the battery pack to temperatures above +140°F (+60°C) may cause the battery to rupture, fail, or
reduce performance.
In case of exposure to the cell contents, wash the affected area thoroughly, and seek medical
attention.
RBRC INFORMATION
As part of our commitment to protect the environment and conserve natural resources, Uniden
voluntarily participates in an RBRC® industry program to collect and recycle used Li-Ion batteries
within the US.
Please call 1-800-8-BATTERY for information on Li-Ion battery recycling
in your area.
(RBRC® is a registered trademark of the Rechargeable Battery Recycling
Corporation.)
E-53Uniden MHS335 Radio Owner’s Manual
COMPLIANCE
FCC Part 15
The equipment has been tested and found to comply with the limits for a Class B device, pursuant
to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference
will not occur in a particular installation. If this equipment does cause harmful interference to radio
or television reception, which can be determined by turning the equipment off and on, the user is
encouraged to try to correct the interference by one of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and the receiver
• Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
• Consult the dealer or an experienced radio/TV technician for help.
writing by Uniden.
This device complies with Part 15 of the FCC rules. Operation is subject to the following two
conditions: (1) This device may not cause harmful interference, and (2) this device must accept any
interference received, including interference that may cause undesired operation.
annuler le droit à l’utilisateur de faire fonctionner cet équipement.
doit être approuvé par écrit par Uniden.
Avis de conformité à la FCC : Ce dispositif a été testé et s’avère conforme à l’article 15 des
règlements de la Commission fédérale des communications (FCC). Ce dispositif est soumis
aux conditions suivantes: 1) Ce dispositif ne doit pas causer d’interférences nuisibles et; 2)
Il doit pouvoir supporter les parasites qu’il reçoit, incluant les parasites pouvant nuire à son
fonctionnement.
Controlled using condition:
Only be operated by well-trained or qualified person.
IC
This device complies with Industry Canada's license-exempt RSSs. Operation is subject to the
following two conditions:
(1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause undesired
operation of the device.
Cet appareil est conforme aux normes CNR d’Industrie Canada destinés aux appareils radio
exempts de licence. Son fonctionnement est soumis aux deux conditions suivantes :
1) Cet appareil ne doit pas causer d’interférences nuisibles et;
2) Il doit pouvoir accepter les interférences, incluant celles pouvant nuire à son fonctionnement
normal.
Conditions d’utilisation des restrictions:
Operated by seulement be ainsi à trained qualified person d’or.
E-54 Uniden MHS335 Radio Owner’s Manual
THREE YEAR LIMITED WARRANTY
WARRANTOR: UNIDEN AMERICA CORP. (“Uniden”)
ELEMENTS OF WARRANTY: Uniden warrants, for three years, to the original retail owner, this
Uniden Product to be free from defects in materials and craftsmanship with only the limitations or
exclusions set out below.
WARRANTY DURATION: This warranty to the original user shall terminate and be of no further
effect 36 months after the date of original retail sale. The warranty is invalid if the Product is (A)
installed, (D) serviced or repaired by someone other than an authorized Uniden service center for a
defect or malfunction covered by this warranty, (E) used in any conjunction with equipment or parts
or as part of any system not manufactured by Uniden, or (F) installed or programmed by anyone
other than as detailed by the Operating Guide for this product.
STATEMENT OF REMEDY: In the event that the product does not conform to this warranty
at any time while this war-ranty is in effect, warrantor will repair the defect and return it to you
without charge for parts, service, or any other cost (except shipping and handling) incurred by
warrantor or its representatives in connection with the performance of this warranty. THE LIMITED
WARRANTY SET FORTH ABOVE IS THE SOLE AND ENTIRE WARRANTY PERTAINING TO THE
PRODUCT AND IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES OF ANY NATURE
WHATSOEVER, WHETHER EXPRESS, IMPLIED OR ARISING BY OPERATION OF LAW,
INCLUDING, BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE. THIS WARRANTY DOES NOT COVER OR PROVIDE
FOR THE REIMBURSEMENT OR PAYMENT OF INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow this exclusion or limitation of incidental or consequential damages so the
above limitation or exclusion may not apply to you.
rights which vary from state to state. This warranty is void outside the United States of America.
PROCEDURE FOR OBTAINING PERFORMANCE OF WARRANTY: If, after following the
instructions in this Operating Guide you are certain that the Product is defective, pack the Product
carefully (preferably in its original packaging). Include evidence of original purchase and a note
describing the defect that has caused you to return it. The Product should be shipped freight
prepaid, by traceable means, or delivered, to warrantor at:
Uniden America Corporation
C/O Saddle Creek
743 Henrietta Creek Rd., Suite 100
Roanoke, TX, 76262
Issue 1, November 2017
QUESTIONS?
Contactez-nous au
www.uniden.com.
Imprimé au Vietnam
QUESTIONS?
Visit our website at
www.uniden.com.
Printed in Vietnam

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