A lot of the telecom GPSDOs that speak SCPI have no way of running except in a 
"position hold" mode.   The Trimble Thunderbolt and telecom GPSDOs (like the 
NTBW, NTPX, etc) units can run in a dynamic environment... how well they do 
that is left as an exercise for the user to determine.  They also have commands 
for specifying the movement environment to expect.

All the GPS timing receivers that I have can work in either a dynamic or fixed 
position mode.  Most also have a way of specifying the movement environment / 

> In addition to TimeNuts, there are actually *are* people who get nutty about 
> measuring 
changes in gravity.

Hey!   I resemble that remark!  I have a Worden gravity meter around here... 
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