This summer in late August I was cruising up the Tred Avon river in a light fog with a good 75 yards visibility and light winds. There is a marker that sits right on a Longitude line on the chart. I was running down the same longitude line and was planing to turn at the mark. I saw the dreaded shore first and finally found the the marker 100 yards off the longitude line. The land was actually on the longitude line as displayed by the GPS. The chart is 3 yrs old. Would anyone know what might have been going on? Could the GPS be that far off? The day before it seemed ok. The trip a few weeks earlier it was dead on. Thanks Doug Kelch "Seas the Day" __________________________________________________ Do You Yahoo!? Send FREE video emails in Yahoo! Mail! http://promo.yahoo.com/videomail/