After take off PX4 loses global and local positioning?

[kory.smith]

I solved my problem and hope this solution can help others in the same situation.

The PixRacer R15 has 2 Magnetometers, and the GPS has 1.

I was disabling Mag0 and leaving the 2 on the board enabled. When the board would pull current the mags would bugger up giving errors on local and global positioning from the power boards EMI and result in several fail safes being triggered.

SOLUTION:
Disable the two onboard Mags (mag1 && mag2) and enable only the GPS mag(mag0) in the parameters.
I got this idea when finding the below post solutions.

GPS Orientation - Pixracer - mag sensors inconsistent

I have had the same problems with a mRo Pixracer and the mRo dual compass. Was possible to fix by rotating the compass from the original setting indicted by the arrow printed at the USB contact. I rotated the unit so the printed x-coordinate (for the LIS3MDL compass) now is pointing forward. I have the Taoglas antenna pointing to the sky and y direction is to the right hand side seen from behind. A calibration with setting “Rotation None” for the external compass gave a perfect result and elim…