While the "G" may mean global that does not mean you get the same number of satellites regardless of where you launch. Usually I get 10 to 15 satellites(P3P), but there have been some areas such as the bottom of valleys where I only got 7 or 8 satellites to start until I get high enough. I don't remember ever finding myself in an area with only 3 satellites.
Even in my house (wood frame) while doing an IMU calibration I get 7 or more satellites.
The OP (P3A, which also uses GPS/Glonass) may be launching from the bottom of a deep canyon or an area surrounded by tall buildings or other tall metal structures.
Even in my house (wood frame) while doing an IMU calibration I get 7 or more satellites.
The OP (P3A, which also uses GPS/Glonass) may be launching from the bottom of a deep canyon or an area surrounded by tall buildings or other tall metal structures.