Ok.. its already been stated that Gross tonnage is not really what the ship weighs.. so how is it calculated then? Just curious. Is it the weight of the water it displaces? I can't believe that because then when you put any 'extra' wieght on board it would sink. Bernouli's principle.. Anyone know? I always assumed that it was the weight of the ship...
gross tonnage is a measure of volume, not a measure of weight at all. 1 gross registered ton is 100 cubic feet or 2.8316 cubic meters.
However, the measurement of ships in gross registered tons is an outdated means of measure. The gross registered ton has been replaced by the gross ton, a number which is non-dimensional. 1 gross ton is the value V of a ship's enclosed space in cubic meters which is multiplied by a factor which is 0,2+0,02*log10V.
Hi Jim C.,
In case you missed Dave's post about it, there is a great article in the February 2007 issue of Cruise Travel magazine by Theodore Scull, pp.50-51, that goes into this subject in a great deal of detail. It cleared up a lot of my misconceptions and vague notions.
Check it out.