Air Navigation Pro Using Integrated iPhone GPS without a sim card

I use Air Navigation Pro with my iphone on a passenger seat of the  plane. Integrated GPS function works  just fine without a SIM card installed, but only to a certain speed ~300 km/h or height then it can’t find any satellite at all. Can be this problem be solved with the integrated GPS?

Thanks for that, Paulfromwallasey. I live in a rural area without many cell towers and with WiFi only in my home. I do use offline maps (topographical and street maps) on my iPod Touch 4 outdoors (not needing a signal, WiFi or cellular). I also have a hand-held Garmin GPS receiver but would rather use the GPS in the iPhone (its positional accuracy, while likely being lower than that obtained from my Garmin, is likely sufficient for my needs).
I guess that one of the questions that I was asking is if I were to purchase a used iPhone 4 from someone, and the SIM card have been removed, would the device's GPS still work with GPS-enabled apps (albiet without the cellular-assist)?
Can any pay-as-you-go SIM card be purchased for and used in a deactivated iPhone4? Would this even be necessary for the GPS?
Thanks again.

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