Hmm whats the shortest length they can be in feet to be in your "ship" Category
A ship is any vessel capable of taking to the open water for extended periods. Therefore technically a racing yacht is a ship and a short sea crossing (such as Dover-Calais
In the same environment) could possibly be argued as a boat.
But as this is Mr WM topic and he asked no o/t discussion,
my 3
Pride of Bilbao
http://www.simplonpc.co.uk/POPortsmouth/PrideOfBilbao-igb20040604-01.jpg
St Nicholas (as was)
Sealink St Chris. (as was) (sister: Anselm- never went on it)
http://www.hhvferry.com/stan_chrisbrpass.jpg