XXX, 3G IPAD with aeroplane mode on. When you open Ozrunways, GPS still comes up as 'active'. Left it on the dash today for 10+ minutes and couldn't get anything to 'lock on'. Did drain the battery like the GPS was on though. Having flown 'track up' on Boeings for the last 16 years, it's jus something i've become used to.
The external GPS is so that I can be more assured of getting an actual position and don't have to work out my position from lat/ long all the time. That said, having the IFR waypoints showing on the WAC certainly makes it easier to orientate yourself.
Capt Fathom, I thought I had tried with aeroplane mode off previously but can't remember for sure. It'll be about four weeks before I can try again (yay for holidays) so I'll have to leave it for a bit. Obviously most of the flying I do is outside of 3G coverage anyway.