When I was playing with an Adafruit GPS,  it appeared that if it thought you 
were not moving it would go into a pseudo-position-hold mode and the output 
coords would not change.  It took it a while to start outputting new coords 
when you started moving again.  This test was at walking speeds.  I had to walk 
maybe 100 feet before it started sending new coords.
I assume it is actually producing fixes,  but not changing the output sentences 
(i.e so that a car stopped at a traffic light does not show it moving randomly 
around the intersection).                                          
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