[VLM]

It helps if the opposition is dumb enough to use a predictable route each day such that you've got a known plaintext attack. Then it amounts to playing yesterday's path, very loudly, today, and it'll fly in a straight line thinking its right on course.

Technically you need multiple recordings so you can switch between them to trick it to climb, descend, etc on command.

Also it helps if the opposition insists on not only flying the same exact "known plaintext" route over and over, but using a predictable precise number like 3000.000 meters on that route.