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The Panbo blog describes an amazing collection of material to get all your manuals in PDF form, which many find easier to search, not to mention stow,plus a phenomenal collection of both NOAA (and Corp of Engineers) charts—every single one available, raster and vector—and the nautical publications made available by various government and state agencies as PDF's. Look at the Panbo blog link below for what else is mentioned.

Panbo blog Dumptrucks of data

Your enthusiasm may vary but I ordered the DVD set on the spot.

Managing the waterway DVD set

John