Yes Virginia, you can go to the water without a map! GOOD LUCK! on making it back in one piece, if at all...

Navigation Rules Online U.S. Coast Guard
USACE Navigation Information Connection ... see the Towboat Locator!
Navigation Information USACE Louisville District
Navigation Information USACE Mobile District
Navigation Information USACE Nashville District
American Practical Navigator ... National Geospatial-Intelligence Agency
USACE Navigation Data Center ... Useful data

Time of Transit Calculator.....A Blue Herons Nest product
Range and Fuel Cost Calculator.....A Blue Herons Nest product
Great Circle Ed Williams

Links: (for Tides)
Tidal Heighth and Current Predictor, Univ. of S. Carolina....
NOAA/NOS Tide Water Level and Current Predictions....