Raymarine Heading Sensor, Owner'S Handbook Manual

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Chapter 4: Calibration
2. If the Heading Sensor’s readings are less than the actual readings,
rotate the sensor slightly clockwise.
If the Heading Sensor’s readings are greater than the actual
readings, rotate the sensor slightly anti-clockwise.
3. Check the headings again, and repeat step 2 if required.
4. When the headings match, tighten the Allen bolt to hold the sensor
in its new position.
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