M_Boats: miles between ports

Does anyone know where on the web I can find nautical miles between rts, -- example how many miles using the ICWW between Brownsville and Galveston, Or from Pensacola to Key West. How about Miami Harbor Entrance to Hamilton, Bermuda. -- I heard there was a nautical chart company that you could any put in any two harbors (or cities) and it would give you the air distance and the nautical distance using normal shipping lanes. But I can find it???