My recent experience of using a drone at sea and in an environment in which the GPS signal can be lost got me to thinking. Would it be possible to incorporate a homing signal into drones? The idea would be to use a device that transmits a homing signal that could be picked up at longer ranges than signals between the drone and the controller. A homing device would remain on the ground and could presumably transmit a stronger signal than the drone or the controller, and it could also have a larger antenna. Including this technology wouldn't require increasing the weight of the drone. It could presumably be used as a fail safe precaution that would allow the drone to fly toward the direction of the homing signal, and it would eventually either reconnect with the controller or be visually spotted by the operator.