Earlier quoted context omitted.
I have a small Meshtastic device, not quite button-sized but still tiny. The chip on it supports aGPS, so I can upload the almanac and prime it with the approximate location. I'm very familiar with this process, I wrote a small utility for my cell phone back in ~2010 after I screwed up its factory image by installing Cyanogen.
Nice, I have a few mestastic widgets, but do want something small enough for a dog collar. That way my wife and I can carry a radio and keep one in the car so we have a good chance getting in range. Sad that most of ham radio, which has similar APRS for tracking, doesn't do async or multi-hop.
I have not tested it, but it should be hackable. I have a couple of discrete RAK chips, and I've ordered a PCB with a trace antenna for them.