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: Thomas Kleemann
Date: 2009 Sep 16, 23:36 +0200
From: Thomas Kleemann
Date: 2009 Sep 16, 23:36 +0200
I own among other an older Magellan GPS 300. Once I checked my radio clock against it and found a difference of several seconds (!). Even more disturbing was, that the difference was gaining visually observable. Finally I realized, that whenever the time display page of the unit was opened, the time was in accordance with the the radio clock. My conclusion is, there must be a very odd internal mechanism to display the time (software counter or similar), that is started with the original reading of the GPS signal every time one goes to this page. /Thomas douglas.denny@btopenworld.com schrieb: > Any differences found in the display of a GPS receiver must be, as Mr. Parsons says, due to processing variations within the software to the display. The GPS signal itself is the most accurate global time source easily available next to the helium maser or caesium fountain standard used for standardisation in the bureaux of standards such as Teddington in Britian and Boulder Colarado USA. --~--~---------~--~----~------------~-------~--~----~ NavList message boards: www.fer3.com/arc Or post by email to: NavList@fer3.com To , email NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---
