Answer
Length means 96 per cent of the total length on a waterline at 85 per cent of the least moulded depth measured from the top of the keel, or the length from the fore side of the stem to the axis of the rudder stock on that waterline, if that be greater.
Gross Tonnage means the measure of the overall sizeof a ship determined in accordance with the provisions of the present Convention.
The Gross tonnage of a ship shall be determined by the following formula:
GT=K1V
Where: V = Total volume of all enclosed spaces of the ship in cubic meters,
K1 = 0.2 + 0.02log10V
Unit of GT is a combination of logarithmic value (volume unit) and cubic meters, which have no physical significance, so we consider GT unit-less.
GT Significance –
3.Registration of fees is based on GT
4.Manning regulations based on GT.
5.Safety rules based on GT
6.Applicability of various conventions, regulations.
7.P&l is also based on GT
• Net Tonnage means the measure of the useful capacity of a ship determined in accordance with the
provisions of the present Convention.
The Gross tonnage of a ship shall be determined by the following formula: NT = K2Vc (4d/3D)2 + K3(N1+N2/10) a.The Factor (4d/3D)2 shall not be taken as greater than unity;
b.The term = K2Vc (4d/3D)2 shall not be taken as less than 0.25 GT; and c.NT shall not be taken as less than 0.30 GT, and in which:
Vc = total volume of cargo spaces in cubic meters,
K2= 0.2 + 0.02log10Vc
K3 = 1.25 (GT+10,000)/10,000
D =moulded depth amid ships in meters as defined in Regulation.
d =moulded draught amid ships in meters at summer Loadline.
N1= number of passengers in cabins with not more than 8 berths, N2= number of other passengers.
N1+N2 = Total Number of Passengers the ship is permitted to carry as indicated in the ship’s passenger certificate; when N1+N2 is less than 13, N1and N2 shall be taken as 0