Question 1 of 4
Is the vessel under 24 metres load-line length?
The threshold is load-line length, not waterline. Check the builder's plate or stability book.
Question 2 of 4
How is the vessel chartered?
If it varies through the year, pick the broadest type that ever applies.
Question 3 of 4
What is the primary use?
The use the vessel is built around — not the occasional one.
Question 4 of 4
Where does it operate?
Operating area drives the Category (UK) or Class (Irish PBL).