Furuno FAR-2107(-BB) - Manual (Page 141)

3. TARGET TRACKING (TT)
3-3
3.3 Activating, Deactivating TT
To activate or deactivate the TT:
Left-click the arrow in the TT ACQ MODE box at the right side of the display to
show OFF, MAN, AUTO or AUTO MAN as appropriate
TT AUTO
MAN
TT ACQ MODE box
3.4 Entering Own Ship's Speed
The TT requires own ship's speed and heading data. The speed can be STW,
SOG or echo-referenced speed (based on 3 max. stationary objects). Manual
input is also possible.
For automatic or manual input, see section 1.13. For echo-referenced speed
input follow the procedure below.
3.4.1 Echo-referenced speed input
The use of echo-referenced speed is recommended when:
• The speed log is not operating properly or not connected to the radar.
• The vessel has no device (doppler sonar, speed log, etc.) that can measure
ship's bow-stern, port-starboard movement.
If you select echo-referenced speed, the TT calculates own ship's speed relative
to a fixed reference target. The number of targets may be R1, R2 or R3. When a
plural of objects are selected, the mean value is used, for stabilization and
speed.
1. With the cursor inside the effective display area, roll the scrollwheel to
display "REF MARK / EXIT" in the guidance box.
2. Select a small fixed island or any radar prominent point located at 0.2 to 24
nm from own ship.