Problem calibrating external compass on Pixhawk

Hi all,

I have a Pixhawk and an external GPS/compass on my quadcopter.  I believe the Pixhawk is using the latest firmware (I updated it a couple days ago).  The GPS/compass is not a 3DR-branded one.  Anyway, I go through the calibration in MP, selecting the Pixhawk option for the calibration.  I end up with these huge compass offsets - up in the 500s and 600s.  On the Flight Data page, though, the vehicle always seems to know pretty well which direction it's pointed.  But, because (I think) the offsets are really high, I can't arm the motors unless I turn off the prearm check, and when I fly, I get lots of failsafes that I think are being caused by the EK/DCM failsafe.  Can anyone help me figure out why I can't properly calibrate my compass?

Thanks

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