QUADCOPTERS have reached such a technologically advanced stage that many of them even have autopilot features that are guided by a GPS. In association with other sensors like 6-gyro, pressure,  ultrasound, infrared and vertical camera, it’s possible to deliver reliable flight stabilization for multi-rotors. The GPS module make possible some incredible capabilities as:

Self-Leveling: when the pilot releases the remote control sticks (pitch/roll) , the quad remains stable at the same level.

Altitude Hold: the Quad have the ability to keep the distance from the ground with no throttle adjustment.

Return Home: when pressing a button, the Quad automatically return to the point where its initially took off.

Waypoint Navigation: the pilot can set specific points on a map that Quad will follow as part of a flight plan.

Fail Safe Returning Home: when the Quad loses contact with transmitter, for any reason and including low voltage from battery, its initiate a return to the initially took off point or hold altitude and position for a moment and starts a vertical landing procedure.

Circling Mode: a kind of geo-fencing that provides a virtual and safe box around pilots, preventing drone from flying too close.

Loiter Mode: when turned on, automatically attempts to maintain the current location, heading and altitude. It relies on the GPS locked before takeoff.