Currently Being ModeratedNov 11, 2013 3:23 PM (in response to MartinB737)
GLONASS capability started in the 3rd gen (cellular) iPad, so I have to believe it is still a feature in the (cellular) Air even though the tech specs don't mention it specifically.
I don't know that there's been any improvement in GPS/ GLONASS performance (not that any was needed) but I'd say having the integrated capability is superior to having some add-on device, which may bring the Wi-Fi model's price right up to the cellular model.
Currently Being ModeratedNov 11, 2013 4:13 PM (in response to MartinB737)
Thanks for all the inputs so far! According to this article an external GPS (garmin, dual, bad elf) is more reliable/consistent than the internal, at least in the air (aviation). Price of an external unit is on par or even less than the in-built gps.