How many different types of ships can you think of in 10 seconds?
you cannot include these:
Warships of any kind - aircraft carriers or battlecruisers - any ship that is used on war
Commercial ships - no cruise ships - no ocean liners - no ferries, no ships which carry people.
Cargo ships - no bulk carriers, no oil tankers, no chemical carriers - no ships which transport goods.
Oooooh - That was narrowed down quite alot