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On Thursday, November 11, 2004 10:30 AM
Trevor J. Kenchington said:
> I guess I will check my GPS display against the dial-up time signal
> from Canada's NRC. If it is tracking UTC, then it presumably will
> continue to do so. If it is fast by a good number of seconds, I'll
> abandon the idea of using at a time reference.
Wait a few minutes after you turn the GPS on. The leap second correction is
included in a 12.5-minute message cycle, and if your unit hasn't cached it
from the last time it was on, you'll have to wait until the next time it
comes around.
The other problem with using a GPS receiver as a time source is that the
software is rarely designed to make correct time display a priority.
Updating the display can take a back seat to message processing and position
computations. I've noticed that my old Garmin 75's time display is a
noticeable fraction of a second behind the ticks on WWV/CHU. Newer units
with faster chips my do better.
-- Peter
