Why gps glitch when activated mavros gps

ArduCopter Copter 4.2
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1

I have tried mavros GPS on quadrotor. But every time the Mavros GPS is turned on (guided mode), a GPS Glitch notification appears so that the vehicle goes into land mode.

what is the cause? and what is the solution?

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2

Typicylly the problem are too many tall buildings or electromagnetic interference.

Google for “GNSS multipath” for more info

And update to ArduCopter 4.3.3

3

UPDATE :
mavros GPS will work if HDOP is below 0.7