Seiwa SW AP01 - Manual (Page 24)

HEADING ADJUST The current fluxgate heading is displayed and compass mounting
errors may be compensated using the arrow keys.
AUTO This is one of two options to reduce deviations caused by
COMPASS magnetic components and material on the vessel. To carry
CALIBRATION out this calibration, press the right arrow. The display reads:
TURN 360 DEGREES
With the vessel under way and steering it by hand, turn it slowly
through a full circle. You may turn either to port or starboard, but
the same direction should be maintained until the circle is
complete. The digital display shows the angle turned through so
far. When the circle is complete, the display shows the calibration
results, eg.
CAL OK B
The letter at the end indicates the quality of the field. A and B are satisfactory. C indicates poor field quality and
re-location of the compass and/or manual calibration is recommended.
Press STANDBY to return to normal operation. This method of calibration is
simple and is a recommended procedure for all vessels. However
there are some magnetic anomalies which are not fully removed.
The manual calibration option provides a further refinement of
compass accuracy.
Note. If a rate gyro is fitted, it is turned off automatically by selecting the
calibration option and should be turned on again when calibration is
complete.
MANUAL
COMPASS
CALIBRATION Press the RIGHT ARROW when this message ap pears. The
main digital heading shows the current heading and the deviation:
DEV +00
Turn the vessel to a heading which is close to one of the cardinal or
inter-cardinal points, ie.
000, 045, 090, 135, 180, 225, 270, or 315. 23
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