Arming Check Fails - GPS Vertical Speed 0, needs 0.45 m/s

Hello, I'm having an issue where my plane won't arm using NMEA GPS on a pixhawk. 

Message it gives: "GPS Vertical Speed 0.00m/s needs (0.45)"

Surprisingly, this has nothing to do with either of the GPS checks -it will only go ahead and arm if I disable the INS arming check.

I'm having trouble making sense of this, shouldn't the GPS Vertical speed be zero at rest?

I have an identical setup that arms without issue.  Is my INS bad? I have not been able to find any information about this in the documentation.

(re-calibrated 3D accel with no change in results)

(Using AP 3.52, downgraded to 3.50 with same results)

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