I have seen much more impressive technology on the RC boards, although admittedly, not about altitude. For instance, I was just watching first-person-view (FPV)

I have seen much more impressive technology on the RC boards, although admittedly, not about altitude. For instance, I was just watching first-person-view (FPV) autonomous planes with head-tracking and on-screen-displays (OSD) flying several miles with a UHF setup at about 1W.