Disable GPS and compass
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 I tried unplugging the GPS module but got an error in qgroundcontrol that the compass is missing. Looks like there's one on the GPS board. What parameters do I need to change in qgc to disable GPS and the compass so I can arm and fly with the GPS module unplugged? 
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 @Hunter-Scott , please try setting the following PX4 params to disable magnetometer : - SYS_HAS_MAG to 0
- EKF2_MAG_TYPE to 5
 
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 Thanks, this worked! 
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