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.
Looks nice for some uses, but pretty big for a dog collar, almost 3" on a side. I've some long/thin dev boards that I could pair with an 18650 that should be closer to 1".
I'm planning to use a small LiPo battery with a JST connector. The whole footprint should be slightly larger than 3x4x1 cm. Still a bit too large for a pocket device, but perfect for a collar.
Sounds great, best I found so far is the RAK19007 (30x60mm), then add a GPS (RAK12500). It will be kind of long (60mm + case) but not too wide (30mm + 3d printed case).
Or the Mesh Node T114 Development Board V2 (23mm wide).
