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).
User triggered calibration
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Note: Before the calibration is started, make sure that there is
enough open water around the vessel to make a full turn.
The Calibrate option is used for manually starting the heading
calibration procedure.
During this calibration, the compass measures the magnitude and
direction of the local magnetic field.
The illustration shows magnitude of local field in percentage of
earth's magnetic field (A), direction of local field (B) with respect to
the boat's centerline (C).
Follow the on-screen instruction, and use about 60-90 seconds to
make a full circle. Keep turning until the system reports a pass.
• If the local magnetic field is stronger than the earth’s magnetic
field (the local field is reading more than 100%), the compass
calibration will fail.
• If the local field is reading more than 30%, you should look for
any interfering magnetic objects and remove them, or you
Software setup | IS42 Operator Manual
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