Compass Issues

Hi, so I’m flying a fixed wing with a pixhawk 2.1. I’m trying to fly with an external compass but no matter what compass I try to use, when getting prepped for flight they are always off around 10-15 degrees. Sometimes there will be a 30 degree difference. We are using a small flight strip that’s used for hobby stuff of this sort, and it’s aligned with magnetic north i believe(i might be wrong tho).

Is there anything I can do to fix this issue or are there are better compasses to buy that someone recommends. I also have the compass near the front of the fixed wing, away from most of the other electrical parts I have aboard.

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