Lawrence Rep once told me to check if my Point 1 was calibrated by doing this procedure;
Turn on the Heading Extension and the Course Extension. Find area on water that has no wind/waves and no current to affect boat travel direction. Slowly motor forward in straight line. The course extension line will cover the heading extension line if the point 1 is calibrated. If they are two separate lines it is not calibrated.
I have tried this and it seems to work.


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