I used our 3210 from San Francisco to San Diego, and it worked like a charm...the
radar overlay was great. I only noticed one discrepance on the
charts, and that was after we had docked in one port. I had tracking on the whole way, and it showed that had we gone strictly with the chart (like at night in fog), we would have hit one dock...actually the tracking showed that we would have gone through two docks. The problem was probably in the original chart that was scanned for the plotter, because all other orientation of objects was good. That just goes to show you how important it is to use your own eyes, in conjunction with what a plotter or chart is showing you.