Furuno CI-68 Installation Manual page 38

4. ADJUSTMENTS
WT SPD CALIB
Calibrate ship's speed in the water tracking mode. In general, enter the same value as
the [GT SPD CALIB]. (-12.8 to 12.7 (%))
BEARING CALIB
Calibrate bearing offset angle of the transducer. When the transducer's fore-aft axis is
deviated to starboard from the ship's fore-aft line, set a positive angle. (-30 to 30 (°))
COURSE CALIB
Calibrate course here when the course value in ground tracking mode is different from
the external GPS navigator reading though [BEARING CALIB] on the previous page
is done correctly. The setting range is -30 to 30 °. The [GT] and [NAV] values next to
[COURSE CALIB] show the calibrations of [CSE CALIB MODE] in below.
CSE CALIB MODE
Choose tracking mode to use to calibrate course so that it is the same on both the cur-
rent indicator and GPS navigator.
[GT]: Enter suitable value so ship's track in the ground tracking mode is the same as
that on the NAV mode.
[NAV]: Assuming that the tide near own ship is constant, offset it so tide in fore-aft di-
rection is constant for ten minutes.
[MANUAL]: The course manually entered at [NAV] in [COURSE CALIB].
CSE CALIB EXEC
Calibrate course. Choose [GT] or [NAV] from [CSE CALIB MODE] and then choose
[YES] here.
When ground tracking is obtainable (Depth is approx. 3 to 300 m)
1. Press the TRACK MODE key to choose the ground tracking mode.
2. In the [CALIB] sub menu, to press
3. Press
4. Run the vessel at a speed of about 10 kn, keeping heading constant. To minimize
gyro speed error, it is desirable to turn along parallels; namely, eastward or west-
ward.
5. Press
6. Press
7. Press the F1 key to start the calibration. As soon as you press the F1 key, [0.0] on
the [COURSE CALIB] line should be shown in reverse video. After you have trav-
eled 2 nm, the display will show the course calibration angle (result of the calibra-
4-4
to choose [GT].
to choose [COURSE CALIB EXEC].
to choose [YES].
or to choose [CSE CALIB MODE].