Satellite positioning can only help a drone hover in an unobstructed outdoor area free of interference. Without satellites, the drone will not be able to position and become susceptible to drifting.
The Mavic acts on your every instruction almost instantly. Whether you want to shoot a slow, graceful flowing shot, or get your blood pumping at 40mph (65kph) speeds in Sport Mode.
An unprotected drone could hit obstacles during long distance flight or when descending from an inadequate height in Return to Home mode. The Mavic uses FlightAutonomy technology to sense obstacles up to 49ft (15m)