Now that I’m about to embark on the naval aspect of the war, I’m confronted with the need to know how fast a sailing ship would travel from one port to another. Naturally it would depend on the overall design, size, and tonnage of the ship, plus weather and wind speeds. And you have to keep in mind things like the depth of the water. Can you get a vessel of a certain size through that channel or will it run aground? To calculate that you need a good chart of the sea roads, and the times of the incoming and outgoing tides on that particular day. All of which are readily available . . . not.