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Cedar Rapids, Iowa | Having the base within a mile of the rover will help ensure that both receivers can see all of the same satellites, and thus can use all visible satellites in the solution. There may be certain times of the data where you have a low number of visible GPS satellites, or their geometry is poor, which will cause poor DOP numbers and potentially less accuracy. When that happens, usually the visible part of the constellation will change enough in 15 or 30 minutes that you'll be fine again.
There is a handy satellite predictor here:
http://satpredictor.navcomtech.com
GLONASS gives you more satellites, which pretty much eliminates any poor geometry issues. | |
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High VDOP errors...
