Originally Posted by fordarrick
nob quest.........What is HDOP? And what is it used for? Thanks
I believe it is "Horizontal Dillution of Precision", and it roughly translates to how precise the location projected of GPS is (higher is worse...think variance). I typically get numbers below 1 on ET systems with 8-10 sats, and I don't know what the relative "meaning" is (like is is 1foot, meter or what). Use it for a relative measure of 3D positioning signal resolution. Typically, I think hand held GPS use this to draw the error circle around your location...larger radius for more variability and uncertainty with worse signal or fewer sat locks.