[amsat-bb] GPS Time observation

[Vince Fiscus, KB7ADL]

I have an old GPS unit, a Magellan explorist 210.  It's fairly accurate 
determining position. After it has acquired about eight to ten satellites 
the position error averages between 20 to 35 feet.   Now the question, the 
other day I was looking at one of the information pages the unit can 
display and on it, it gives the time in UTC. Just for fun I thought I would 
see how close the time was to WWV.  I was surprised to see the unit was 
between one to four seconds off over various tests compared to WWV.  IS 
this typical of all GPS units or do some display the time of day more 
accurately?

KB7ADL