In the download section i found the "simplified manual targeting 100% realism" by hitman. To use this, you had to know the lenght of the ship.I seem if you know the kind of ship you should know the lenght,too, but the recognition manual in TMO 2.5 do have the height of the mast, but not the lenght of the ship.

Obviously Hitman have had it.
Greetings, Arnauld