Here is another source for NGS markers. http://joe.mehaffey.com/gsmmarkr.htm Also, the vertical accuracy of GPS is ABOUT 1.5 times the horizontal accuracy. This is because you can get satellites signals from below you but you can get satellites all around you to help with the horizontal position. I would caution folks not to accept all the low accuracy values unless you take a full day (or more) of data. Typically accuracy is mentioned as the data points containing 95% of the observed points. At this time I am accepting the 7-9 meter values I quoted earlier because these are 24 hour measurements. I have not yet "surveyed" my normal observing position with my GPS but I suspect I am plenty close as it is. Certainly GPS now allows a person to observe from a new site without having to get topo maps, etc. Ron Lee ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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