Japan Radio NKE1130 Marine Radar User Manual
Japan Radio Co Ltd. Marine Radar JMA 9100 series RADAR Instruction Manual
a href="https://usermanual.wiki/Japan-Radio" itemprop="url">
Japan Radio >
Contents
- 1. Users Manual 1
- 2. Users Manual 2
- 3. Users Manual 3
- 4. Users Manual
Users Manual 2
![JMA-9100 Instruction Manual > 5.OPERATION OF TARGET TRACKING AND AIS > 5.1 PREPARATION5－95[2] Relative Vector ModeThe relative vector does not represent the true motion of the target, but its relative relation with own ship. This means that a target with its relative vector directed to own ship (passing through the CPA Limit ring) will be a dangerous target. In the Relative Vector mode, it can be seen at a glance where the CPA Limit of the dangerous target is.Therefore, the True / Relative mode shall optionally be used for the purpose of observation: the True vector mode for grasping the true aspect of a target, and the Relative vector mode for grasping a target’s closest point of approach (CPA).Fig 5-5: Relative Vector5.1.3.3 Vector Length (Vector Time)The vector length of a target is proportional to its speed, and the vector time can be switched in a range of 1 to 60 minutes.The diagram below illustrates a vector length of a target for 6 minutes, and the tip of the vector represents the target's position expected to reach 6 minutes later.Fig 5-6: Vector LengthRefer to Section 5.1.6 "Setting Vectors (Vector Time)". The true vector isnot displayedRelative vectorCPA ringHLCurrent positionFuture predicted position(6 min later in this example)HL](https://usermanual.wiki/Japan-Radio/NKE1130.Users-Manual-2/User-Guide-994638-Page-1.png)