You could use a raspberry pi
They make all kinds of things out of them. You could make a cell phone, cell phone with a GPS, cell phone gps, am/fm radio... Or skip the phone part and just go gps. You get to use whatever battery packs you want too so battery life is in your hands.
DIY this way also lets you add other things to the pi
. Faster to buy a GPS
Looks like a fun project for sure but I’m not trusting anything I built in the wilderness! Maybe I’ll get my pi out and build some shit this week
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