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Raymarine forum / Raymarine Forums / Autopilots v / [CA] [CA11] St70 AP heading about 40 degrees off from actual compas heading

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[CA] [CA11] St70 AP heading about 40 degrees off from actual compas heading
09-16-19, 05:54 PM (This post was last modified: 09-17-19 08:44 AM by Chuck - Raymarine - Moderator.)
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Tomoffmic Offline
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[CA11] St70 AP heading about 40 degrees off from actual compas heading
Most of the summer my ST 70 AP heading has been about 65 degrees off from my actual compass heading. pretty much always read about 307 mag
When I engage AP tracking the boat does a hard starboard Crazy Ivan and I have to release AP and take back control.
Today I placed a large heavy magnent next to the GPS compass donw below and now its only about 40 degrees off. Did the large magnet some how un stick the heading or is the gps compass unit itself maybe bad?
I'm still trouble shooting this issue since early june. (Boat is new to us this year) St 70 AP with e120 HD display
Thanks


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[CA11] St70 AP heading about 40 degrees off from actual compas heading - Tomoffmic - 09-16-19 05:54 PM

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