iPad with cellular only has realtime GPS (wifi-only iPad uses aGPS, non-realtime)
TL;DR Cellular version of iPad does not come with GPS module I've just learnt lately, iPad with cellular and without cellular isn't just about if one can use simcard and mobile data on the go, you are missing the chance to use a realtime GPS too. It's must to have GPS module when using Apple Airplay in car drive. I chosed a non-cellular iPad for mysself as most of my time is spent at home (with 24h wifi), and I had believed that every iPad has its own GPS chip where in fact and be able to use real-time GPS, but it's otherwise, wifi-only model iPad don't has an actual GPS integrated, it uses aGPS instead . GPS chip only available on cellular version of iPad, but non-cellular iPad location is determined through connected Access Point (or hotspot) WiFi-signal, where it has the name of "Wi-Fi Positioning" (Assisted-GPS). If accurate realtime GPS positioning is important to you, please consider getting the cellular iPad model even if you know yourself very well