It uses GPS to know its location on the globe. It then measures "earth rates" on all three axes and determines if the rates match what is predicted based on that location on the globe.
@@stuartgray5877 This was a while ago but as I recall it was with respect to having to manually enter the coordinates and why that is since GPS can pinpoint coordinates to within 50 feet.
I thought the system used GPS for location data.
It uses GPS to know its location on the globe. It then measures "earth rates" on all three axes and determines if the rates match what is predicted based on that location on the globe.
@@stuartgray5877 This was a while ago but as I recall it was with respect to having to manually enter the coordinates and why that is since GPS can pinpoint coordinates to within 50 feet.