This is part of a continuing advice column for Somali pirates.
This is a container ship. You can tell it is a containership by the boxes on the deck. They are called containers, because they contain things. Let's not go into what they contain because that's a little bit complicated, but trust me they contain things.
The ship below is a cargo ship. It also also contains things, but in the hold. See those cranes? Many cargo ships have them, which is a bit of a giveaway.
But the ship below is something else. It is a navy supply ship. French. You see the round things sticking up at the front? That's radar. They can see you. And the flat bit at the back? Helicopter pad.
Of course, the way you can easily spot them is when you see one of these.
Mind how you go.