If your iPad mini does not have the internal GPS, I.e. It's a wifi only model, I have the Air2 in the same configuration.
I use Bad Elf Pro via Bluetooth connection for the GPS input.

I have not tested, but I believe the Nano Data logger will also connect via Bluetooth. Using Bluetooth in the nano decreases battery life by 1/2 according to the manual.
I run ForeFlight on the Air2 with the Bad Elf GPS data for powered flying.
I connect my nano to Oudie for glider.

BillT