Has anyone ever run a curiosity check... say 6 people approach a cache with 
their GPSrs.. 2 Magellan, 2 Garmin, 2 assorted... all different models...all 
with identical coordinates, same day/same time. 

Are there significant margins of error between a) different models/ same 
manufacturer; b) different manufacturers  at a time when weather/ satellite 
reception/ foliage/ sunspot activity is identical and can be discounted as an 
accuracy factor??    Which brands/models fare best?