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Old 18-08-2015, 20:44   #16
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Join Date: Aug 2012
Location: Cruising the Gulf of Mexico.
Boat: 1980 Morgan 415
Posts: 1,341
Re: Too much deviation

I noted a similar issue with my AP that came up on occasion. After noting that it was displaying my true course over ground as opposed to which way I was pointed, it became a non issue.

Looking for another pretty place to work on the boat.

Working on spending my children's inheritance.
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Old 18-08-2015, 21:16   #17
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Join Date: Mar 2013
Location: sailing south
Boat: Ericson 35-2
Posts: 301
Re: Too much deviation

On Canada's left coast magnetic declination is almost 20 degrees, so the distinction between T and M is really easy to notice and grasp. I wish my problem was just that.

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Old 18-08-2015, 22:48   #18
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Boat: RR370
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Re: Too much deviation

From Raymarine:

"If the deviation figure exceeds 15 or the display shows no deviation value, the compass is being affected by ferrous objects on your boat. You should move the compass to a better location. Higher deviation figures are acceptable on steel boats."


"Check the heading reading against a number of known headings, plot a deviation curve, and determine the heading alignment value that will give the lowest average alignment error. You can then enter this value on the Heading Alignment screen, as described above. If the average heading error is more than 5, you should perform the compass deviation correction procedure again, circling more slowly and in more favorable conditions."

Originally Posted by RedHerring View Post
> DC wiring anywhere near the sensor?

Windlass power wires live in the bilge about a foot under under the sensor. No current in them, of course.
Beware of intermittent interferences that can force a tack or a jibe.

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