In general, if the GPS unit will work with the device, Avenza Maps will use it as well. We have only tested with Garmin and Bad Elf GPS receivers, so we know they work, but cannot guarantee that any others work. The steps provided above were for the Windows version of the app which allows users to select the GPS receiver to use inside of Avenza Maps. Unfortunately, this behaviour is for Windows only, and on Android and iOS platforms, there is no way to specify the GPS receiver to use.
If you have any other questions please feel free to contact our Support Team directly using the contact form at help.avenzamaps.com