iPad mini 6 and GPS

Only WiFi+Cellular models of iPad have GNSS/GPS capabilities - 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 between iPad models may significantly impact your ability to use mapping or other Apps that require precise location data.

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 - both of which require an active network connection. 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.  Without a network connection, location services won't work at all.

Your iPhone does have GPS capabilities - however, the iPhone’s derived GPS location is not shared with other devices via a hotspot tether. The location derived from the iPhones IP Address is likely to very far from your actual location, even perhaps in a different country.

If you need to have precise location data, 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 GNSS/GPS positioning services.

Alternatively, you can also use a third-party Bluetooth GPS receiver with your WiFi Only iPad (connected via Bluetooth USB) to provide GNSS location services.  BadElf and Garmin GLO are two readily available examples.

You can tether it to your iPhone via the personal hotspot but then it uses cellular data. I don;t think there is a possibility that you can tether GPS signals