> But why does the location of my fishing hole change off the SC coast > occasionally STILL? I don't buy it. There's too much at stake for them to > throw that towel in at this point in time. There is a certain amount of error in resolving GPS signals to a true coordinate. The greater number of "birds" your receiver uses helps remove most of this error but it requires an additional signal that provides the local error correction "fix" to get pin point accuracy. Many major airports now have the local error correction transmitter to aid automated landing systems, this is nothing more than a GPS receiver anchored to a known point constantly checking its position, calculating the local error and transmitting this information to GPS systems able to receive it. The engineers at Honeywell's flight systems facility tell me that the chances of repeatability for any GPS receiver not supported by local error correction are slim and none. This does not mean that your reading should be off by a great margin. If you find Great Uncle Henry's grave and mark the location with GPS you should be able to return to the site with GPS; if your reading of a site at different times varies by a great amount you probably bought a low quality receiver. While it is true that a few yards, meters, rods or chains make no difference when attacked by a "nuke" they make a great difference when GPS is used to control the conventional weapons that are used daily in combat world wide. GPS works everywhere, not just in the US of A. To subscribe, change options, or unsubscribe please see the instructions at http://listlva.lib.va.us/archives/va-roots.html