Hi,
Great ! I tried with the nav file of the base instead of the rover and it worked! Thanks a lot for your help and your patience.
So far I always put the nav file of the rover. Then, I searched a bit about putting the nav file of the base instead and found this on the forum :
So basically, we have better to put the nav file of the base most of the time ? Since it has more chance to have a clear sky view rather than the rover.
Thanks again you helped us a lot.