Posted by Leopard18 I know many of the higher end systems (like the DJI phantom series) have GPS tracking, so it is possible to set a point to return to. That being said, they tend not to have obstacle avoidance, so monitoring battery life is key. Some also allow the user to program the maximum range it will fly, so it won't come close to the signal range.
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All drones above the $600 mark have a GPS build in.
When they lose the signal or the battery goes down they are going into a homing mode. This means they are going to a certain altitude and return home. So even if you flew near ground, they will fly high and go home.
As said, this also happens when the battery goes down.
Now this is in automatic mode, if you fly full manual, this of course doesn't work.
Most of them allow you to program a minimum altitude for auto homing and a maxium for normal flight.
The range is by law on sight but most can do about 2000 ft. And you will have a hard time to see them after that distance anyways.