a note of caution:



it's curious that this comes up so soon after that article in Sail magazine, which followed an article in Good Old Boat, which followed an article in Passagemaker (me, nautically obsessed? nah!)



one can really only be 75% sure of the data on NOAA's charts of well-traveled commercially valuable waterways such as the Chesapeake and Buzzard's Bay. on a primarily recreational lake surveyed by god-knows-who, I don't think I'd want to flirt too closely with the shallow-water marks.



anyway, my point is to bear in mind that while your GPS may accurately fix your position within 5 feet, the chart data within may not be anywhere near that accurate.