In case anyone else is considering it, I just bought and returned one of these. http://www.amazon.co.uk/gp/product/B00N ... ge_o02_s00 Shame, looked perfect as it's lightweight and waterproof with decent battery life. Maybe I just got a duff one - 10 minutes after switching on it returned the correct location, half an hour later it gave me Hamburg, Brazil, Pacific Ocean, Russia.... Left it outside on top of the shed all night, still way off today - so back it goes. Which ones have people had success with ? Also where is the best place to mount it ? I'm guessing on the gimbal protection plate at the bottom of the landing gear, opposite corner to the compass ?