Quick question....
If I want to take advantage of GPS apps such as Waze, Google Maps, Apple Maps or others....
Will a WiFi iPad Air be fine or do I need a cellular version due to the GPS chip inside?
If you want Google Maps to go into detail out in the field... then you'll want cellular. If you just need GPS coordinates or a broad map view of where you're at without detail updates... then wifi is fine. I think it's definitely worth the extra 100 bucks or so to go cellular. It comes in VERY handy!
What do you have for a cell phone/data plan? You could always tether your phone to your iPad if your data plan lets you.
If you want Google Maps to go into detail out in the field... then you'll want cellular. If you just need GPS coordinates or a broad map view of where you're at without detail updates... then wifi is fine.