Because of a surgery I won't be able to go outdoors before a good month, I will get my spark 1st week of August, as it's my 1st drone I will try to practice indoor. I doubt there are any gps signal in my concrete appartement, so should I totally disable gps?
There is no way to turn OFF the GPS, other than wrapping aluminum foil around the back side of the aircraft.
You shouldn't have to worry about a GPS lock when inside unless you are close to a window. Even then, you would need at least 8 or more satellites to get a good lock and you shouldn't get that through the window.
The things you do want to be sure of is that the apartment is well lit and there's a pattern to the floor ( the Visual Positioning System needs to "see" the floor).
Make sure all Bluetooth devices are OFF.
Be cautious of the WiFi as the other WiFi signals in your building may affect the Spark?
If that's the case, then it looks like the OTG cable is working (again) for some devices.
Use your prop guards. Stay away from the ceiling as the propwash tends to suck the Spark up to it ! The same goes for walls.
I last thing, Tripod mode. The Spark will will react slower to the stick movements.
Low and slow, practice, practice, practice.
Good Luck.
