>Would this discrepancy be due to improper factory calibration of the unit, or >can a unit slip out of calibration? Or might the discrepancies be due to the >installation of the ship-mounted unit, or what? Inquiring (armchair) >navigators want to know. Almost always, this sort of discrepancy is due to setting the wrong reference datum into the receiver. Most topo sheets use NAD27 (North American Datum, 1927) as their baseline for measurement. There are many, many others. Chances are the discrepancies were all almost the same distance, and always the same distance and direction of displacement as well. In effect, GPS receivers don't go out of calibration because they constantly update their references which are continually downloaded from the satellites. *************************************************************************** PaddleWise Paddling Mailing List Submissions: paddlewise_at_lists.intelenet.net Subscriptions: paddlewise-request_at_lists.intelenet.net Website: http://www.gasp-seakayak.net/paddlewise/ ***************************************************************************Received on Sat Mar 13 1999 - 18:51:30 PST
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