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V_c = total volume of cargo spaces in cubic meters.

K₂ = 0.2 + 0.02 log₁₀ V_c.

D = molded depth amidships in meters, as “molded depth” is defined in §69.53.

d = molded draft amidships in meters, as “molded draft” is defined in §69.53.

N₁ = number of passengers in cabins with not more than eight berths, as “passenger” is defined in §69.53.

N₂ = number of other passengers, as “passenger” is defined in §69.53.

GT = gross tonnage as determined under §69.57.

N₁ plus N₂ must equal the total number of passengers the vessel is permitted to carry as indicated on the ship's Passenger Certificate. If N₁ plus N₂ is less than 13, both N₁ and N₂ are zero.

NT must not be less than 0.30 GT.