Every weapons system, every ship at sea, every ship based defense system, every anti-missile system, every military aircraft in the air, every Humvee and military vehicle, every missile, every battlefield, every possible military target in the world is GPS enabled, GPS mapped.
GPS IIIA satellites (IIIC deployment complete 2020) will transmit signals that will enable both civilian and military to determine their position to within 3 feet, compared with the 10 feet. And once enough IIIC satellites enter the constellation, positioning within 6 inches will be possible for all users, according to DoD. This tech has anti-jamming capability that remains a secret.