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Garmin Compass Calibration

Old 11-23-2017, 06:04 AM
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Default Garmin Compass Calibration

My Garmin 7616’s and GHC 20 autopilot are set to magnetic north. They are both off by 13 degrees from my Ritchie compass. Is there a way to calibrate them to be equal with my Ritchie compass?
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Old 11-23-2017, 10:48 AM
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How do you know the riche is right? I never trust those little things.

If the Garmin was calibrated correctly on s seatrail I would trust that one more then the mag. How does your cog compare while moving in no wind / tide to the other 2.

If you have radar overlay you'll know if the Garmin heading is correct. That is the best way to set heading.
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Old 11-24-2017, 10:21 AM
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Default Thanks!

I re-ran the dealer autopilot setup on the Garmin AP and its now within 5deg of the Ritchie. Thank you!
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Old 11-25-2017, 04:10 AM
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Originally Posted by wfrueh View Post
I re-ran the dealer autopilot setup on the Garmin AP and its now within 5deg of the Ritchie. Thank you!
You can go into the dealer setup menu of the AP and make fine adjustments to the heading to eliminate the discrepancies. However, that is not something you should do to match the Ricthie but rather to eliminate the difference between the GPS COG and the compass heading.

Run the boat N,S,E,and W on a calm day and check the AP compass heading against the GPS COG. If the differences are consistent, then you should use the fine heading adjustment to have the same readings from both.

If the Ritchie is showing a different heading from the AP afterwards, it needs to have its compensation adjusted to match the electronic compass.
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Old 11-27-2017, 02:09 PM
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Use your iPhone as a tiebreaker to see which one is off.
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