CompuServe Messages

Hi Robert, Thanks for the info. Wish I could believe your figures, but having spent a field season with a Trimble Scout and occassionally with two other geologists with a Garmin (don't know the model) and a Magellan Meridian I find that the system tends to typically produce readings that vary more like 50-200 m. Such variations can be within an hour or two or several days apart. By this I mean taking a reading and at the same spot taking a reading an hour later or days later and having the two readings differ by that much in lat and/or long. Or, taking readings with my Scout and one of the other units side by side and having the two readings vary by up to 200 m. We either all have faulty machines, or the system does not give the accuracy often stated. The error Guy referred to was a reading in the west desert of Utah I made last October. Out of several readings taken several miles apart, they generally plotted on a 15 min topo map within the area I thought I was standing. But this one reading plotted about 2 miles off. The actual spot was easy to determine because of the terrain, which was low hills and I was standing on the top at the edge of a particular drainage. I didn't notice the error until I got home and checked it out of curiousity. Did you really mean to say "errors up to 20 metres or so due to multipath"? From my experience in canyons I would say that error could more than likely be 200-2000 m! Lanny