What is the difference between net tonnage and gross tonnage?

Correct Answer: Option C — Net tonnage is the gross tonnage less certain deductible spaces.

Net tonnage represents the vessel's earning capacity, derived by subtracting non-earning spaces—such as crew quarters, navigation spaces, and machinery—from the gross tonnage. Gross tonnage measures the total internal volume of the ship, while net tonnage reflects the volume available for cargo and passengers, as defined in 46 CFR Part 69.