[ntp:questions] how do you like the Trimble Resolution T

[John Hasler]

Richard B. Gilbert writes:
> ISTR that only three satellites are required to determine the location
> of your antenna.

Only if you already know either one of your three space cooordinates or
the time.  Four equations, four unknowns.

> Once this position is accurately known, you can live with a single
> satellite.

As long as you stay still.
-- 
John Hasler 
jhasler at newsguy.com
Dancing Horse Hill
Elmwood, WI USA