Furuno FCR-28x9 Manual De Usuario
3. TARGET TRACKING (TT)
3-2
3.3
How to Input Your 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) taken from this radar.
Manual input is also possible.
or echo-referenced speed (based on 3 max. stationary objects) taken from this radar.
Manual input is also possible.
For automatic or manual speed input, see section 1.14. For echo-referenced speed
input see the next section.
input see the next section.
3.3.1
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 that can measure ship's leeward movement (Doppler so-
• The vessel has no device that can measure ship's leeward movement (Doppler so-
nar, speed log, etc.) when leeward movement cannot be disregarded.
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 1, 2 or 3. They appear as tracked
targets, each denoted with a small circle. When a plural number of objects are select-
ed, the mean value is used.
fixed reference target. The number of targets may be 1, 2 or 3. They appear as tracked
targets, each denoted with a small circle. When a plural number of objects are select-
ed, the mean value is used.
Note: This feature is not available when the AIS is active.
1. RIght-click the display area to show the context-sensitive menu then select [REF
Mark].
2. Select a small fixed island or any radar prominent point located at 0.1 to 24 nm
from own ship.
3. Use the trackball to put the cursor (+) on the target selected at step 2.
4. Push the left button to insert the reference mark.
4. Push the left button to insert the reference mark.
5. Repeat steps 2-4 to continue entering reference marks. Three may be entered.
6. Right click the Sensor information box then choose [Select Sensor] and [Setting].
6. Right click the Sensor information box then choose [Select Sensor] and [Setting].
Open the [SPD] page and put a checkmark at [Reference SPD]. Click the [OK]
button to finish.
button to finish.
Notes on speed input by reference target
• Reference targets are only used for the calculation of true speed.
• Do not use reference target generated true speed to calculate relative speed. Rel-
• Do not use reference target generated true speed to calculate relative speed. Rel-
ative speed data is not accurate because response to speed change is slow, ham-
pering the TT's ability to accurately judge the possibility of collision.
pering the TT's ability to accurately judge the possibility of collision.
• Select a stationary target as a reference target to calculate own ship speed as
ground tracking speed. Do not choose a moving target as a reference target. A mov-
ing target produces error in the vector for TT and AIS, which results in wrong colli-
sion avoidance information. Further, an unstable stationary target produces
inaccurate speed data and the target itself may become lost.
ing target produces error in the vector for TT and AIS, which results in wrong colli-
sion avoidance information. Further, an unstable stationary target produces
inaccurate speed data and the target itself may become lost.
• When a reference target is lost or goes out of the acquisition range, the reference
target mark flashes and the Alert 528 "REF Target Lost" appears in the [Alert] box.
Changes to in three minutes
R01
R01