(Prelude edit: A few people seem to be missing the point I'm making here. I know quite a lot about the predator, and a bit about the Global Hawk. I do not know much about the Sentinel. The jab about building a drone with parts on my kitchen table is a joke, meant to illustrate that this is either an absurd level of incompetence on the part of Lockheed Martin [not likely] or the article is incorrect, the latter being…
I won't comment on the UAV in the article, but you'd have to be a pretty wealthy person and have some really weird stuff on your kitchen table to have what is on the global hawk. I won't comment on specifics, but there is nothing simple about its gps and inertial navigation systems. Your categorization of UAV's was fairly simplistic and there are many more categories than two. The Global Hawk is a much more expensive…
Of course I don't have the requisite materials or fabrication equipment to build the type of inertial navigation equipment used in missiles.
My point was that, if the article is to be believed, and RQ-170 relies completely on GPS and gyros, then I have the stuff needed to build its guidance system.
(The point here being that of course I don't, and of course it's likely more complicated than a GPS, so the article is probably incorrect)