I get it, FB, and I'm not disagreeing with the technology available nowadays to a terrorist with $$s in his pocket. What I am at odds with is the tenuous relevance to ADSB. You've managed to squeeze in your point because the drones use GPS, as does ADSB but, whereas it's obviously a favourite topic of yours, it really has nothing to add to Dick's question. Might I suggest you start a different thread and discuss your GPS drones there, rather than clog up the ADSB thread with irrelevance.
(And the gyros know where they are in the first place because you tell them, just like every inertial platform and you don't need GPS for that).