Drones are a special case set up to be flown remotely...cameras, instruments that broadcast EVERYTHING...much like flying a sim. And drones are flown via satellite, or when close, via remote...so range is really no constriction. B777's, or any commercial A/C for that matter don't have that kind of "broadcast" capability. So any remote pilot wouldn't have access to those instruments, let alone throttle control, flaps, etc. And considering that they had switched off the transponders of the A/C (Both Mode C, and ADS-
there was no "tracking" of the plane, so no idea of position, altitude, heading etc...
BTW, Mode C is today's common technology and works off of land based radar. ADS-B is the new technology, used more around the world than here is the USA, but we are switching over slowly (hear of NEXGEN? That is part of it) and it is based off of GPS, satellites, and ground reporting stations...the stations talk to the satellites.
Sorry if this is a bit boring, but it IS my life..(ugh)