phantom 4+

Just received the unit back from DJI. Now every time I fly it says "weak GPS signal" Tried in the city and out in the country . Out in the country it showed 16 satellites - in the city 11. All updates have been performed. Firmware is up to date. Calibration completed. Any help?

So, NO I have not read the full manual yet, but I keep getting a message on the Pro+ screen asking me to calibrate "RC compass" with a blue figure eight diagram that I can not seem to be able to complete successfully. I have never seen this in previous Phantoms or online anywhere and wonder if...