Of relevance to Oz drone ops...
via
http://www.pprune.org/military-aircr...rone-down.html
"A U.S. Air National Guard MQ-9 Reaper unmanned aircraft dropped out of the sky while conducting training operations at altitudes greater than 18,000 feet above Lake Ontario, service officials said. "The satellite control link failed and the aircraft descended into the lake"..."
From the thread, poster
Stuff notes...
"I'm not in the know but doesn't the loss of the vehicle imply 2 failures?
First the loss of satellite link and second the failure of the return to base feature?..."
.