Re: GPS



On Mar 23, 6:52 am, adacrypt <austin.oby...@xxxxxxxxxxx> wrote:
In passing, for my information how do builders use GPS to mark out
foundations of new buildings to an acceptable degree of accuracy if it
has such absolute error? - adacrypt

http://en.wikipedia.org/wiki/Real_Time_Kinematic

The operating principle is that you have a reference GPS
receiver in a known position that measures the systematic
error.

See also: Differential GPS
.