3 ms·
The US has done tests with eLoran as well. The receivers are quite expensive and the signal isn't permanent yet, so it's more of a lab thing right now. Also exp
by geerlingguy 25d ago
The US has done tests with eLoran as well. The receivers are quite expensive and the signal isn't permanent yet, so it's more of a lab thing right now. Also experiments with BPS (Broadcast Positioning System) using high power TV transmitters to distribute time and position in urban areas (very hard to overpower that signal).