2. Radar Operation
2-8
2.5 How to Input Your Ship's Speed
The Target Tracking (TT) and azimuth stabilized presentation modes require own ship speed input and compass
signal. The speed can be entered from a log (STW) or GPS (SOG), or manually from the menu. Note that FURUNO
GPS Navigator GP-90 provides COG and SOG.
For more information about positioning and Kalman filter operation, see Chapter 15 Navigation Sensors.
2.5.1 Speed selection for SPD and SB (TT, AIS and trails)
The system speed that is used for TT, AIS and trails appears at the upper right corner in fields "SPD" and "SB."
These values are used for:
- Calculation of target CPA/TCPA
- Target past position
- Target trail
Note 1: SPD: Longitudinal speed, SB: Transversal speed, positive value to starboard
Note 2: When the AIS feature is active, MANUAL and REF are not available for selection.
To select system speed "SPD" and "SB", do the following:
1. Put the cursor on the SPD or SB field in the information area then push the left button to show the following
dialog box.
2. Put cursor on Speed source (LOG(BT) in this case) and use scrollwheel to select appropriate source.
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