Captain and Mrs.....
The title "Captain", or the abbreviation CAPT would be appropriate. The salutation in a letter might read "Dear Sir" or "Dear CAPT Smith". When a politician or military officer retires, he's allowed to use the form of address of the highest rank held.
The word "nautical" relates to ships, sailing, or navigation at sea.
Thomas Arnold - Navy captain - died in 1737.
Thomas Arnold - Navy captain - was born in 1679.
A Royal Navy Captain is the same as a United States Navy Captain - it's the equivalent of a full Colonel in the armies of both countries. The next rank up is Commodore - Brigadier equivalent.
John Knatchbull - Royal Navy captain - died in 1844.
No, the equal rank in the Navy or Coast Guard is a Captain.
Hugh Pigot - Royal Navy captain - was born on 1769-09-05.
Hugh Pigot - Royal Navy captain - died on 1797-09-21.
Frederick Lewis Maitland - Royal Navy captain - died in 1786.
Frederick Lewis Maitland - Royal Navy captain - was born in 1730.
John F. Kennedy was a captain in the Navy. He served in World War II and commanded a patrol torpedo boat.