This article explains how to create a new vessel.
Step-by-Step Guide
Go to Setup > Organization Structure.
Select the unit under which you want to create a new vessel (usually it is Vessel Pool).
Click Create New > Vessel.
You can do it either from the ribbon menu.Or by right-clicking on the selected unit.
Fill in all the necessary details and Save the changes.
Your vessel is not ready. It will be located beneath the corresponding unit.