Here's another definition, a little vaguer, but with reference to gross tonnage being a factor in port fees, which I didn't know.
This is from Glossary of maritime terms
GROSS & NET TONNAGE(GT and NT) - Gross tonnage is the basis on which manning rules and safety regulations are applied, and registration fees are reckoned. Port fees are also often reckoned on the basis of GT and NT. GT and NT are defined according to formulas which take account, among other things, of the volume of the vessel's enclosed spaces (GT) and the volume of its holds (NT). GROSS REGISTERED TONS - A common measurement of the internal volume of a ship with certain spaces excluded.
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The mass market lines have 'classes' of ships ... generally two or more 'sister' ships form a class. They are the same size and have roughtly the same layout and features. The class us usually named after the first ship of that design.
For example RCL has a group of ships of the same size and design as the Radiance of the Seas. The Radiance was the first of this group to be built, so as a group, they are called Radiance class ships.
I guess what all that means is... that measurement boils down to how much stuff you could squeeze into all the interior spaces if you were filling it up with something like sacks of flour. But that number (90,000...75,000...etc) doesn't really give you a clue as to whether the ship is crowded with wall to wall people or if it has a lot of open spaces.
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The mass market lines have 'classes' of ships ... generally two or more 'sister' ships form a class. They are the same size and have roughtly the same layout and features. The class us usually named after the first ship of that design.
For example RCL has a group of ships of the same size and design as the Radiance of the Seas. The Radiance was the first of this group to be built, so as a group, they are called Radiance class ships.
Aha...thank you...that makes perfect sense!
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The Radiance Class ships are arount 90,000 gt.
Their passenger capacity is ~ 2500;
Radiance of the Seas seas is 962 feet long.
So...Would you call that a big ship?
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