Yep, and that gps data had zero encryption, which is my point entirely.
Non encrypted stuff is almost too easy to steal, and you can't encrypt the command and control units on drones without negatively impacting performance.
Properly hardened encryption takes time to process. And when speed is of the essence (like you are trying to maneuver a drone through a mountain pass so it doesn't hit the side of a mountain, or maneuvering a tank in a place like NYC so it doesn't ram into a building and get stuck), encryption is useless.
It's a major flaw in remote control warfare, and it's why it's not being widely adopted.