skydog5

Quote from Fizzymagic: If you display the time on the unit as UTC, it is correct. It only appears off by an integral number of minutes on the local time display No it's not. I checked. However, your advice about clearing memory worked, as long as I inputted the EXACT time to start with. I think what happens is it only synchronizes seconds, because the clock DOES reset when you re-initialize.

If the satellites have VERY accurate clocks, and the time signal is essential to navigation, and the satellite sets the time on the reciever, them the reciever knows the correct time and is not displaying it correctly. "The clock time has no bearing on the capacity to navigate, it simply tells the time and nothing more. Telling one the time isn't a great priority for these type of GPS units as it generally worries more about doing other things."

Anybody have any info on the clock accuracy of a Magellan Sportrak Pro? I have checked the clock on this thing against WWV and NBS time and it is a whole 2 minutes slow! The navigation is not affected, only the time display. I know the clocks on the satellites are accurate down to the nanosecond. There is one possible error I know of involving leap seconds, and that produces a maximum error of about 12 seconds. I called Tech Support and they just said, "Yeah, they do that. It could be off by as much as 3 Minutes." But how can this be and still navigate?? Anybody else out there with a Magellan product or any other GPS exhibiting this kind of behavior?