Originally Posted by
Niner Lima Charlie
The cellphone GPS sensor will not update fast enough for aviation use.
I use an iPhone 6 plus with Skydemon and never had any signal issues with the inbuilt GPS, it always works like a dream. That said I've got a glass canopy on my aircraft (Eurostar) so I'm not sure how a metal roof GA aircraft would fair, but I recently tried it on a B737 flight from Austria and it worked perfectly there too, even in the cruise. I was sat by the window though which may have helped, it was very impressive to see 460kts on the GPS log!
I've also got an iPad mini with Bad Elf plug in GPS for longer flights which I feel is the ideal size for a small aircraft.