Sperry Marine 4914-CA, Руководство по эксплуатации, установке и обслуживанию

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In order to obtain correct heading data, the existing alignment error (the
angular difference between the compass orientation and the vessel's
fore-and-aft axis) must be determined and the required correction
applied. Alignment error is 0° if the sides of the compass housing run
exactly parallel to the vessel‘s longitudinal axis and the back of the
housing points dead ahead. The alignment error correction is carried
out electronically by setting the correction value in the Service Setup 1.
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1. Determine the existing alignment error by comparing the compass
heading with the vessel's true heading. The true heading must be
known to an accuracy of at least 0.5°.
2. Go to the Service Setup 1 and select the align error correction sub-
menu, see “Configuration Menu - Service Setup 1” on page 8-1 for
details.
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Risk of inaccurate alignment error correction
The compass must have been in continuous operation for at least 4 hours
before the alignment error can be determined accurately.
If bearing repeaters are used to determine the true heading, these must
be properly aligned to the vessel's fore-and-aft axis.
3. Enter the required correction
value.
⇒
The correction value equals the
alignment error with the sign
reversed.
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The vessel’s true heading is
123.0°,
the compass displays 123.4°,
the alignment error is therefore
0.4°,
thus, the required correction
value is - 0.4°.
compass orientation
vessel's fore-and-aft axis
alignment error
ALIGN ERROR CORR.
SERVICE SETUP
+000.0
°
kçíÉ After accurate correction of the alignment error, the compass is to dis-
play the vessel's true heading with an accuracy of at least 0.5°.