Underdeck tonnage
Measure of ship capacity
From Wikipedia, the free encyclopedia
Underdeck tonnage (UDT) is the measurement, in tons, of the space below a ship's tonnage deck and above its double bottom. In ships with two decks, the tonnage deck is the upper deck; though it is generally the second deck from above in ships with more than two decks.[1] Underdeck tonnage is applied using Simpson's first rule of ship stability.[2] It is measured in gross cubical capacity.[3]
