Thanks for your information! Good to know. With a 4 mile radius, I figured that it had to be designed to allow multiple simultaneous in use, but wanted to hear confirmation, which you gave.
As for a "take over" situation, I didn't know how pairing worked, since I would imagine that if I bought a new controller (i.e. a replacement) that it should work without me doing anything special, yes? Next I started to think that if I were to power up the drone before powering my controller, could someone else with a controller Connect to it before I did? Any facts on this?
No, you cannot buy a new controller and have it work without going through a specific process for binding the controller to your Mavic. Controllers are bound to the Mavic they come with at the factory. They will not automatically connect to any other Mavic.