NavList:

   

Reply

The drift of the clocks in "cheap" GPS receivers has been discussed
on NavList before.

GPS satellites send a pulse once a second generated by their onboard
atomic clocks. It is possible to buy GPS clocks which will correct
for the lag time between the satellite sending the signal and the
clock receiving it and so give time that is accurate to a few
nanoseconds. GPS clocks (as opposed the clocks in GPS receivers) are
the most accurate you can get outside having your very own atomic clock.

I called Suunto this morning, before sending my post, and they
confirmed that the X10 watch has a menu choice where you can run the
watch synchronized with the GPS time signal, so they would appear to
actually be (capable of being) GPS clocks as opposed to watches with
GPS receivers inside them.

Geoffrey Kolbe

   

Reply