Main thing with the iPhone is that when you engage flight mode it switches the GPS off, despite the fact that it doesn't transmit in any way, shape or form. However I've found that it is much less prone to pipping in your ear, unlike the Nokia, if you leave flight mode switched off. Works just fine in the air providing it's reasonably near having a clear view of the sky. The new TomTom iPhone mount is perfect for affixing it to the screen.
There is 1 app in the app store which is any use, called QCTviewer, which will allow you to view the CAA VFR charts as produced by Memory Map, although it doesn't do much more than that at present; no GPX tracing or anything.
If you jailbreak your phone (lots of pros, no cons, but RTFM first) and know how to convert the QCT charts to a vendor-agnostic format you can take your pick as regards software. xGPS can happily utilise them and will record your routes for later scrutiny.
Now you can truly be free from the shackles of the world's worst operating system; the steaming turd that is Windoze Murbile.
