Quote:
Originally Posted by darrellx
The reason I ask is that I have always sync'ed my laptop to an internet time service using a program Dimension4. I notice that with my GPS units, there is a difference of 90seconds between them and the internet.
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If you are going to use an internet time source, why don't you use an NTP client? There are several for Windoze, including the full blown ntp server. Your clock can be correct to within milliseconds. PC/laptop clock chips are not stable enough to maintain better accuracy. You can even feed the output of a GPS into the PC/laptop to manage the clock.
GPS time differs from UTC because UTC has leap seconds and GPS time does not. At present it is 15 secs ahead of UTC. The protocol tells your GPS the difference in seconds so it can display UTC compatible time.
I just tell ASCOM my mount has a GPS and let that worry about the time and location.