Garmin Gt20 Tm Installation Instructions

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DownVü Transducer Installation

Instructions

To obtain the best performance and to avoid damage to your

boat, install the Garmin® DownVü transducer according to these

instructions.

Read all installation instructions before proceeding with the

installation. If you experience difficulty during the installation,

contact Garmin Product Support.

Registering Your Device

Help us better support you by completing our online registration

today.

• Go to http://my.garmin.com.

• Keep the original sales receipt, or a photocopy, in a safe

place.

Contacting Garmin Product Support

• Go to www.garmin.com/support and click Contact Support

for in-country support information.

• In the USA, call (913) 397.8200 or (800) 800.1020.

• In the UK, call 0808 2380000.

• In Europe, call +44 (0) 870.8501241.

Important Safety Information

WARNING

See the Important Safety and Product Information guide in the

product box for product warnings and other important

information.

You are responsible for the safe and prudent operation of your

vessel. Sonar is a tool that will enhance your awareness of the

water beneath your boat. It does not relieve you of the

responsibility of observing the water around your boat as you

navigate.

CAUTION

Failure to install and maintain this equipment in accordance with

these instructions could result in damage or injury.

Always wear safety goggles, ear protection, and a dust mask

when drilling, cutting, or sanding.

NOTICE

When drilling or cutting, always check what is on the opposite

side of the surface.

Loading the New Software on a Memory

Card

You must copy the software update to a memory card.

1Insert a memory card into the card slot on the computer.

2Go to www.garmin.com/support/software/marine.html.

3Select Download next to “Garmin Marine Network with SD

card”.

4Read and agree to the terms.

5Select Download.

6If necessary, select Run or save and open the file.

7If necessary, select the drive associated with the memory

card, and select Next > Finish.

Updating the Device Software

Before you can update the software, you must obtain a

software-update memory card or load the latest software onto a

memory card.

1Turn on the chartplotter.

2After the home screen appears, insert the memory card into

the card slot.

NOTE: In order for the software update instructions to

appear, the device must be fully booted before the card is

inserted.

3Follow the on-screen instructions.

4Wait several minutes while the software update process

completes.

The device returns to normal operation after the software

update process is complete.

5Remove the memory card.

NOTE: If the memory card is removed before the device

restarts fully, the software update is not complete.

Tools Needed

• Drill and drill bits

• 7 mm wrench

• 3 mm hex wrench

• Number 2 Phillips screwdriver

• Masking tape

• Marine sealant

About the Transducer

The transducer transmits and receives sound waves through

the water, and relays sound-wave information to your Garmin

sonar device.

Assembling the Transducer

1Secure the mount À to the transducer Á with the included

8 mm M4 screws Â, 4 mm flat washers Ã, and M4 split

washers Ä.

February 2014 190-01682-02_0A Printed in Taiwan

2Secure the mount to the bracket Å with the included 12 mm

M4 screws Æ, M4 flat washers Ç, and M4 lock nuts È.

NOTE: You can use the 7 mm wrench to hold the lock nut in

place while you tighten each 12 mm M4 screw.

Installing the Transducer on a Transom

Mounting Location Considerations

• The transducer should be mounted as close to the center of

the boat as possible.

• The transducer should not be mounted behind strakes,

struts, fittings, water intake or discharge ports, or anything

that creates air bubbles or causes the water to become

turbulent.

The transducer must be in clean (non-turbulent) water for

optimal performance.

• The transducer should not be mounted in a location where it

might be jarred when launching, hauling, or storing.

• On single-drive boats, the transducer must not be mounted

in the path of the propeller.

The transducer can cause cavitation that can degrade the

performance of the boat and damage the propeller.

• On twin-drive boats, the transducer should be mounted

between the drives, if possible.

Installing the Transom-Mount Hardware

NOTICE

If you are mounting the bracket on fiberglass with screws, it is

recommended to use a countersink bit to drill a clearance

counterbore through only the top gel-coat layer. This will help to

avoid any cracking in the gel-coat layer when the screws are

tightened.

Do not cut the transducer cable. Cutting the transducer cable

will void your warranty.

1Position the transducer mount À at the mounting location on

the transom.

2Align the transducer parallel to the water line Á, and mark

the center location of the two outer holes and a center hole

on the transducer mount.

3Wrap a piece of tape around a 4 mm (5/32 in.) bit at 15 mm

(19/32 in.) from the point of the bit, to avoid drilling the pilot

holes too deep.

4If you are installing the bracket on fiberglass, place a piece of

tape over the pilot-hole location to reduce cracking of the gel-

coat.

5Using the 4 mm (5/32 in.) bit, drill the pilot holes

approximately 15 mm (19/32 in.) deep at the marked

locations.

6Apply marine sealant to the included 20 mm screws, and

loosely attach the transducer assembly to the transom.

7Adjust the transducer assembly so it extends beyond the

bottom of the transom  approximately 3 mm (1/8 in.) on

fiberglass hulls or 10 mm (3/8 in.) on aluminum hulls.

8Make sure the transducer is aligned parallel to the water line.

9If you need to route the cable through the transom, choose a

pilot-hole location well above the waterline à and mark it.

10Place a cable clamp on the transducer cable Ä,

approximately one third of the distance between the

transducer and the top of the transom or the pilot hole.

11Mark the pilot-hole location for the cable clamp, and using a

3.2 mm (1/8 in.) bit, drill a pilot hole approximately 10 mm

(3/8 in.) deep.

12Apply marine sealant to the included 12 mm screw, and

attach the cable clamp to the transom.

13Repeat steps 10–12 to install the other cable clamp

approximately two thirds of the distance between the

transducer and the top of the transom or the pilot hole.

14If you marked a pilot hole in step 9, choose the appropriate

drill bit to drill a pass-through hole completely through the

transom:

• If you have the 4-pin cable, use a 16 mm (5/8 in.) drill bit.

• If you have the 8-pin cable, use a 25 mm (1 in.) drill bit.

15Route the transducer cable to the sounder:

• If you are routing the cable using a pass-through hole,

feed it through the hole you drilled in step 14, and install

the cable-entry cover Ã.

• If you are not routing the cable using a pass-through hole,

route the cable up and over the top of the transom Å.

Avoid routing the cable close to electrical wires or other

sources of electrical interference.

Installing the Cable-Entry Cover

If you routed the cable through the transom after you installed

the transducer, you should install the cable-entry cover to keep

water from entering your boat.

1Place the cable-entry cover À over the hole and the cable,

with the opening pointing downward, and mark the location

of the two pilot holes.

2Remove the cable-entry cover, and, using a 3.2 mm (1/8 in.)

bit, drill the pilot holes approximately 10 mm (3/8 in.) deep.

3Fill the pass-through hole with marine sealant so it covers

the cable completely and there is excess sealant around the

hole and the cable.

4Place the cable-entry cover over the hole and the cable, with

the opening pointing downward.

5Apply marine sealant to the included 12 mm M4 screws, and

attach the cable-entry cover to the transom.

6Wipe away all excess marine sealant.

2

Installing the Transducer on a Trolling Motor

NOTICE

Do not cut the transducer cable. Cutting the transducer cable

will void your warranty.

1Insert the hose clamp À through the slot on the transducer

mount Á, until equal lengths extend on both sides of the

mount.

2Place the transducer mount against the body of the trolling

motor with the front of the transducer pointed away from the

propeller.

3Secure the hose clamp around the body of the trolling motor,

and tighten the hose clamp.

4Position the transducer so it is parallel with the bottom when

in use.

5Use the supplied cable ties  to secure the transducer cable

to the motor shaft or other secure location.

If necessary, fill the forward-facing portion (except the hose

clamp pocket) of the transducer mount with sealant to avoid

accumulation of debris.

6Route the transducer cable to the installation location of the

sounder while taking these precautions.

• The cable should not be routed close to electrical wires or

other sources of electrical interference.

• The cable must not be pinched when the trolling motor is

deployed and recovered.

Testing the Installation

NOTICE

You should check your boat for leaks before you leave it in the

water for an extended period of time.

Because water is necessary to carry the sonar signal, the

transducer must be in the water to work properly. You cannot

get a depth or distance reading when out of the water. When

you place your boat in the water, check for leaks around any

screw holes that were added below the water line.

Testing the Transom-Mount Transducer Installation

NOTICE

When adjusting the depth of the transducer, make the

adjustments in small increments. Placing the transducer too

deep can adversely affect the performance of the boat and put

the transducer at risk of striking underwater objects.

Test the transom-mount transducer installation in open water

free of obstacles. Pay attention to your surroundings as you test

the transducer.

1With the boat in the water, turn on the chartplotter.

2Drive the boat at a slow speed. If the chartplotter appears to

be working properly, gradually increase speed while

observing the chartplotter.

3If the sonar signal is suddenly lost or the bottom return is

severely degraded, note the speed at which this occurs.

4Return the boat to the speed at which the signal was lost,

and make moderate turns in both directions while observing

the chartplotter.

5If the signal strength improves while turning, adjust the

transducer so that it extends another 1/8 in. (3 mm) below the

transom of the boat.

6Repeat steps 2–4 until the degradation is eliminated.

7If the signal does not improve, move the transducer to a

different location on the transom, and repeat the test.

3

Garmin International, Inc.

1200 East 151st Street

Olathe, Kansas 66062, USA

Garmin (Europe) Ltd.

Liberty House, Hounsdown Business Park

Southampton, Hampshire, SO40 9LR UK

Garmin Corporation

No. 68, Zhangshu 2nd Road, Xizhi Dist.

New Taipei City, 221, Taiwan (R.O.C.)

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