NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Measuring time in small boat CN: what devices do you recommend?
From: Rodney Myrvaagnes
Date: 2004 Jan 8, 20:18 -0500
From: Rodney Myrvaagnes
Date: 2004 Jan 8, 20:18 -0500
On Thu, 8 Jan 2004 12:36:33 -0800, Chuck Taylor wrote: >--- Rodney Myrvaagnes wrote: > >> If I understand you correctly, the internal time is >> correct, but the >> display is permanently off by as many leap seconds >> as have passed since >> the receiver was manufactured? ... I am really >> curious about this. > >For details, consult the US Naval Observatory's web >page, specifically > > http://tycho.usno.navy.mil/gpstt.html >> > I was familiar with that site. It specifically states that the corrections are contained in the NAV message and "should be automatically applied by your GPS." I am still wondering if anyone has seen a GPS that did not do so. I bought my first GPS, a Motorola Traxar, in 1989. It visibly inserted leap seconds on the second at midnight UTC (1900 EST). We went on the roof one New Years Eve and toasted the leap second with Champaigne. :-) Since the leap seconds cannot be predicted a long time in advance, the receiver can't have them preprogrammed. Rodney Myrvaagnes NYC J36 Gjo/a "Religious wisdom is to wisdom as military music is to music."
