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Brooke-
 
 From what I've been told, elevation calculations are considered unimportant 
in some models, i.e. for boaters who may be presumed to be at sea level all 
the time. During the Gulf War the government pretended that GPS did not exist 
(i.e., when they told an entire busload of reporters that they were lost in 
the desert for an entire day) and individual soldiers were having their 
families literally MAIL GPSes over to them for navigation use, as the 
government cleaned out all available stocks and still didn't have enough to 
go around.

 My guess is that if one of those models was intended for military use, it is 
using different data streams. And that in any case, the two vendors may have 
used different algorithms to extract their data. So the differences you are 
seeing, are just the differences in two sets of formulas, or the 
civilian/military purposing. I think Trimble always was oriented more for 
surveying and professional use, so they may have spent more "in" their units, 
but that's purely a subjective speculation.

   

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