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Hi again;
Rick is right in respect of Non-complient receivers of whatever make. My
GPS is a 7 year old Trimble Ensign which is non-complient but
"Upgradable". (This means "Dont chuck it away but don't use it for real
on Saturday night!). After Rollover I can reset the receiver by a
process which will wipe all the existing memory and this includes all my
recorded waypoints! When I turn it on again I will have to at least 30
mins for it to copy down all the new almanac data.(If the GPS is moving
while this is being done it could take a lot longer, doing this in my
car travelling south at 70 mph it took an hour to aquire a fix).
Trimble has a good website at  for more
details about their own products and wnro in general.
Another discusion group specific to GPS can be found at the Royal
Institute of Navigation website 

Clive.

   

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