Which GPS do you recommend?

Firstly, get the Wifi+Cellular (3G/4G) iPad which has an inbuilt GPS. This works fine for most people. If you have any problems, or have a WiFi-only iPad, try one of the following:

The Bad ELF GPS Pro is a great device that allows multiple iPads to use a single receiver. Also doubles as a data logger.

The Dual Bluetooth GPS has also been reported as being very good by some customers.

Gamin GLO GPS+GLONASS device that works very well too.

This list isn’t comprehensive, and is based on customer feedback. Technically, any GPS that says it supports iOS should work with OzRunways.