Re: From Raymarine Time change on GPS satellite constellation worldwide
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I believe you are mostly correct, but let me add something.
Your boat's GPS position is based on the elapsed time for a signal to be received from the satellite by your GPS normally utilizing 3 or more satellites that fall in line-of-sight to your boat. Longitude is based on time, but has no impact on the calculation performed in a Furuno GPS.
The error that was experienced during the last rollover had to do with the "year calculation," but not the difference in signal travel time. I saw a Furuno GP80 (very common on SMs) operating perfectly, but with the wrong year associated with the date and time. I saw another GP80 working perfectly with the correct year. The difference was because of the manufacturing date by Furuno. The later made Furuno had been modified, and this modification compensated for the year issue. The later model Furuno was made in 2002. I certainly do not what will happen with other brands.
I am going to guess that any GPS made after about 2000 will be fine, and if it isn't 100% correct, this situation may only affect the year posted on the screen.
On Tue, Feb 26, 2019 at 1:33 PM eric freedman <kimberlite@...> wrote: