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Does drone need back-to-home signal when flying on a pre-defined route? I guess it only needs GPS and that is what might need to be jammed to stop it from following the course.. but how you jam GPS in the sky? hmm..

I also wonder how many drones are actually there as one would only fly for, how long, less than 1 hour? before battery is dead? If it returns to the base, it shouldn't take 10 sherlock holmes to track it?

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Some don't even need GPS, just an inertial measurement unit onboard.

I highly doubt there's a commercial drone out there capable of doing that for more than a few seconds. And if there's one, the cost of the IMU alone would be a pretty strong deterrent against what just happened.

It is perfectly fine to fly without GPS, it isn't part of the control loop. You can navigate with a compass and a clock, it just has increasing errors. Many systems for resetting drift using SLAM techniques, or star observation at night in country areas.

You can jam GPS, but then it'll probably mean planes can't fly, either...

Planes already can't fly if the drone is in the air...

Planes can fly without GPS.

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