Thank you everyone for your help. The two GPS suggestion sounds
interesting, but it appears the decimal reading on my etrex, to 0.001
arc minutes, will only give an accuracy to about plus or minus 6 feet.
Stan
Paul Dickson wrote:
You might try using two GPS's over two survey marks, at the same time (two people) and test how accurate this can be. Even a test case at either end of a 100-foot rope would provide interesting data (can you measure the rope?). More than likely, you'll need a pair of identical GPS units to eliminate any software bias with the signal capture (eg does the unit capture when you press or release the capture button).
There was an article in EVAC's newsletter around 1995 +/- 2 years from Sam Herchak. He reported on a large number of captures to work around selective-availability. There was a plot with the results. This was with just until though.
