[mmooss]

A device can't locate other devices via GPS (GNSS apparently, which includes GPS and other systems); it can only locate itself. GNSS is only a receiver; there's no way to transmit unless you have a satellite. [0]

Having located itself, the device has to transmit its location to other Totem Compasses via other means. It says it uses 2.4 GHz spectrum and some stripped down, low-latency protocol (why does low-latency matter here?).

[0] I can setup a local cellular transmitter; has anyone tried setting up a GPS transmitter and hack it to send other useful information besides PNT? Yes, I know you can send misleading PNT info; I'm talking about doing something useful.