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  The program to eliminate the random SA error in GPS fixes is loaded
into a laptop, to which then the GPS is connected by a serial cable.  The
program calculates the mean fix from its continuous sampling of the GPS
fixes and graphically displays the individual fixes and the mean and
reads out the mean in La, Lo.

  Given the accuracy that the author claims, the SA Watch program would
be significantly more accurate that differential GPS, accurate to a few
centimeters.  I have not used the program in a location that would test
it to its theoretical limits, but I have heard from a friend that
surveyors use something like this to achieve accuracy in that order.

  I suppose the trick would be finding a point of known La, Lo that met
the demands of accuracy sufficient to test the GPS.

  I hope that anyone with more and better information will feel free to
correct me for any errors here.

  Mal Misuraca
  Passage East
  Sausalito
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