Only WiFi+Cellular models of iPad have GPS - this being a function of the iPad Cellular chipset. WiFi Only models of iPad have no GPS capabilities with which iPad Location Services can derive location. This fundamental difference may significantly impact your ability to use mapping Apps - in particular if real-time positioning (e.g., a moving map) is required.
WiFi Only models can only “infer” their location from a database lookup of neighbouring WiFi networks for which the geographic location is known, or the geographic location of your public IP address - not the device itself. For static applications in urban locations, where the location of IP public IP addresses and WiFi networks are known, an “inferred” location can be relatively accurate. However, in rural locations, or when using a Cellular/Satellite/VPN connection, location accuracy of an inferred location [if it works at all] may be very inaccurate.
An iPhone does have GPS capabilities - however, when tethered to a WiFi Only iPad or other device using its hotspot feature, the iPhone’s derived GPS location is not shared with other devices via a hotspot tether.
All this has significant implications for non-static mapping applications. If you need to have moving maps, or have future flexibility to do so, you’ll need to consider a WiFi+Cellular model of iPad. Choosing a cellular model does not commit you to adding a cellular service plan for the iPad, but ensures that you have immediate access to GPS/GNSS positioning services.
If you have purchased your iPad directly from Apple within the last 14-days, you have the option of unconditionally returning your iPad for exchange or refund. As such, such you have purchased a WiFi Only model in the mistaken belief that you would be able to use GPS features, you can potentially exchange the iPad for a WiFi+Cellular model - paying the difference in cost.
You should note that having a WiFi+Cellular model does not commit you to adding a Cellular service plan to your iPad. Many iPad users purchase a WiFi+Cellular model iPad just to be able to use built-in GPS capabilities - and while having the flexibility to use Cellular at a later date, initially have no intention of using Cellular.
Otherwise, you can add a third-party GPS receiver to a WiFi Only iPad - either as a plug-in module, or using Bluetooth. This alternative will likely be more costly than simply opting for WiFi+Cellular iPad. If considering this alternative path, BadElf have good reputation, but their are multiple alternatives.
