How accurate is the eTrex clock?
Q. I know this may sound like a “how long is a piece of string” question, but I am curious how accurate the eTrex clock is? Would it vary much with signal strength? – Ben J A. I think as long as it has a lock on the satellites, the clock should be very accurate, within 1 second. When it has not ‘seen’ a satellite for a long time, i.e., used in door or turned off for a day or two, the clock may drift, once it locks on to a satellite, the clock will correct itself. I compared the GPS time on my eMap to an Oregon Scientific atomic radio clock (very very accurate in my experience), it seems the GPS clock when has a satellite lock is usually within 1 second. – Raymond Chi A. Well, I had an etrex, and I have one of those radio controlled Clocks from Radio shack, and the seconds always matched each other right on. – Tellu A. By design, a GPS clock needs to be incredibly accurate to be accurate. An error of a few milliseconds makes a difference across the distance between the user and the sate
