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Pete, Engineer
Category: GPS
Satisfied Customers: 17698
Experience:  Over 16 years experience installing and repairing electronics.
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My Garmin GHC compass display on the GPSmap 5215 chartplotter

Customer Question

My Garmin GHC compass display on the GPSmap 5215 chartplotter has developed a constant error of 20+ degrees to the left. While it will steer the boat to a selected way point the constant error in the course line presents a problem in avoiding charted hazards whewn manual or autopilot steering. Nothing has recently changed in the placement of the CCU unit. Please advise.
Submitted: 2 years ago.
Category: GPS
Expert:  Pete replied 2 years ago.
I am Pete, and I'll be happy to assist with your question today.
Check for any device that have been placed near the compass and are interfering with it. Even a mobile phone or other wireless device, or a piece of metal or a magnetic screwdriver can be enough to cause a serious error.
Customer: replied 2 years ago.
The unit is located deep in cabinet void where no magnetic object can get can get near it. It was working last year. What else cn the problem be?
Expert:  Pete replied 2 years ago.
Did anything happen around the time the problem first developed?
Perhaps a new radio was installed, or something was changed?
Customer: replied 2 years ago.
Nothing has changed effecting electronics or magentism.
Expert:  Pete replied 2 years ago.
If there is no external interference, then there may be a fault in the unit itself. Try swapping it with another one, or test it on a different boat.