NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: GPS as a time authority
From: Douglas Denny
Date: 2009 Sep 17, 00:54 -0700
From: Douglas Denny
Date: 2009 Sep 17, 00:54 -0700
I think we are in agreement actually. My very point is that the accuracy available with GPS is fantastic - the implementation of how it is displayed apparently though is very poor. Which is very surprising. I was considerably annoyed when I found my Trimble Transpak II had the time display 'out' by one second (knowing the signal is so accurate) but put that down to lag in the display update of the one second intervals. Still, very poor for such a sophisticated bit of kit. You say: "Apparently the early developers of GPS receivers didn't take into account that people would want time to split-second accuracy". All one can say is that as electronics designers, normally dealing with pulse signals to fractions of microseconds - that is very remiss of them if they couldn't be bothered to get the display of time accurate too. Douglas Denny. Chichester. England. Whoa!! The problem is with the amount of time it takes an OLD GPS receiver to display the time, not their internal knowledge of time. Apparently the early developers of GPS receivers didn't take into account that people would want time to split-second accuracy -- it's certainly possible for receivers to display the time correctly. For older receivers that might have meant anticipating the time it would take for the time to be displayed. Respectfully suggest that we learn the model numbers and age of these "slow" GPS receivers before we condemn all GPS receivers. --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---