Most definitely... if I turn on Lady Hather's display filter (which does a 
sliding average of "n" readings)  the standard deviation and jitter values drop 
dramatically.   With a 60 second filter the deviation was down to around .15 
msecs and the peak-peak jitter below a millisecond.  Average and rms values of 
the jitter was 2.4 microseconds.  I saw similar improvements with the cheap 
NMEA receivers.

----------------------
>  Looking at the data by eyeball (maybe not the best way):  A 10 to 30 sample 
> finite impulse average (boxcar) would do a lot for the result.                
>                      
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