Ok… Firstly, there are many guides to doing this already on the internet, but most of the use a Raspberry Pi. I’m not using one, for reasons that will be made clear later.
Secondly, I couldn’t find any one of the guides that did exactly what we wanted.
Before you read all this rubbish, it is important that to use it you will need an Amateur Radio License and Callsign, and and APRS-IS Passcode. If you don’t have them, then go and get them before continuing.
So, with that in mind…