OPERATION
20221537 / D 21
True bearing
Make sure that the gyro compass is selected as active compass.
Refer Selecting active compass, page 25.
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Confirm that the gyro compass’s displayed true bearing is
according to a known target or astronomical observation.
If there is any difference, adjust the bearing according to
Adjusting True heading, page 63.
Latitude
Press the DISP button until the vessel’s latitude is displayed.
The displayed latitude value is calculated based on the vessel’s
true bearing and the vessel’s actual speed. Refer setting the
latitude input source and speed input source, page 61 onwards.
- If GPS is selected as latitude input source, the latitude
obtained from the GPS is displayed on the LCD. Confirm
that the displayed latitude is the same as indicated on the
GPS indicator.
- If GYRO (manual setting of latitude) is selected as latitude
input source and other than MANUAL selected as the
vessel’s speed input source, the latitude will be
automatically updated. In this case, the indicated latitude
should be confirmed every 4th hour when the vessel is in
harbor. If there is any significant difference between the
displayed value and the vessel’s actual latitude, the value
should be adjusted according to Setting the Latitude input
, page
61.
Note! When GYRO is selected as latitude input source and MANUAL
is selected as the speed input source, the indicated latitude value
will not be updated and hence an error may build up.
Speed
The GC80/GC85 gyro compass calculates bearing based on the
speed and latitude information that is input to the gyro as speed
source. Any error in speed input will therefore cause incorrect
true bearing from the gyro compass.
Press the DISP button until the vessel’s speed information is
displayed.
Confirm in 4 hours intervals that the displayed speed is the same
as the vessel’s actual speed.
Any discrepancy between displayed speed and actual speed is
corrected as described in Setting the Speed input system, page
62.
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