On Wed, Mar 12, 2014 at 12:24 PM, Tamas Rudnai wro= te: > Writing this to this list as I know quite few of you have knowledge on av= iation. I am just thinking how could the most sophisticated airliner just d= isappear in thin air? Ground control use radar and beacons as they trust in= these much better than any other positioning devices, I get that. I also t= otally understand that the plane was flying in an area that was uncovered b= y radar - at least by commercial radars. But the most modern airliner has n= o GPS at all on board? Or they do have but just could not send back the pos= ition to the ground control? A reasonably good article on the topic: https://medium.com/evidence-base/47c7e89600ba -p. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .