Why not, jeddy, try to sober up before writing here.

From the link, I note that by default the system uses the unlicensed 2.4 GHz band, same as WiFi. Perhaps 802.11 frames. PTP for synchronization? Authentication? Encryption? It's easy to see potential vulnerabilities. I'm not sure if Jeddy is suggesting this is a good alternative in military conflict situations.

It's still cheaper to place GPS satellites in orbit than to create a world-wide network of ground-based GPS transponders.