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Quoting Gary LaPook :

"WGS84 is a compromise datum that gives fairly good coordinates for
the entire world but is not as good as the national datums"

WGS84 is aligned very closely to the ITRF. If your waypoints, etc.,
have WGS84/ITRF coordinates assigned then navigating with a GPS
receiver set to the WGS84 datum is the proper approach. No compromise
there. But if your waypoints have coordinates from some other datum
and your GPS receiver is set to the WGS84 datum, then beware. With
some choices of datum and grid system, you could be off by more than a
kilometre!

The current North American datum is NAD83. The difference between
NAD83 coordinates for a point and those in WGS84 is generally less
than 2 metres.

===============================================================================
  Richard B. Langley                            E-mail: lang@unb.ca
  Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
  Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
  University of New Brunswick                   Fax:      +1 506 453-4943
  Fredericton, N.B., Canada  E3B 5A3
      Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
===============================================================================

   

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