Need help troubleshooting No GPS / Need 3D Fix

@Vusal_Jalilov wrote:

My 3DR X8+ has just stop getting a GPS signal.
Worked just fine yesterday and days before. Successfully completed dozens of missions just lately

After “inconsistent compasses” message I did a calibration. Still no GPS signal.

x8+ uses 3DR uBlox GPS+MAG LEA6 V1.2, that uses LEA-6h-0-002 u-blox 6 GPS receiver module.
Power LED on the uBlox is ON. FIX is permanently OFF.

I've used "MAVSerial pass" feature of the Mission Planner to connect to u-blox 6 via u-center.

No FIX at all.
ZERO satellites.
Sometimes it shows totally irrelevant Lat/Lon and Datum
Showed FIX = INVALID just once.

Updated the firmware of u-blox 6 with this bin

Still no luck.

Please suggest troubleshooting steps.

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