Aft depth offset
This option allows the system to display two depth readings.
The Aft depth is calibrated in the same manner as the Depth offset.
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Note: Aft Depth is only available when a valid signal is received
from a second and compatible NMEA 2000 or NMEA 0183
device.
Heading
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Note: All magnetic compasses must be calibrated to ensure
correct heading reference.
The calibration must be made on the active compass.
The calibration should be done in calm sea conditions and with
minimal wind and current to obtain good results.
Offset
The Offset option is used for compensating for any difference
between the boat’s center line (A) and the compass lubber line (B).
1. Find the bearing from the boat position to a visible object. Use a
chart or a chart plotter
2. Steer the boat so that the center line of the boat is aligned with
the bearing line pointing towards the object.
3. Change the offset parameter so that the bearing to the object
and the compass readout becomes equal.
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Note: Make sure that both the compass heading and the
bearing to the object have the same unit (°M or °T).
Software setup| AP™ 48 Operator Manual
33
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