Don't know if this has been posted yet or not, this guy did a test with the Futaba 10 (Tiger), dead stock, no mods. Pointed antenna straight out (worst thing you can do) and flew 1.75 miles out, then flipped the antenna up and went out to 2.5 miles, turned around because of battery. http://vimeo.com/21275645 I think GPS is safe with his 2,500' flights.....