Originally Posted by Flatballer
Gross Tonnage is a confusing thing. It's actually related to internal volume, nothing to do with actual weight. Changing the ballast wouldn't have an affect on tonnage, net or gross. Net is the volume of the cargo carrying spaces (not sure how it's calculated for non-cargo ships), also unrelated to displacement.
Gross and net tonnage are what determines the staffing and regulatory requirements, as well as port fees and stuff for ships.
Then why did they take the ballast off?
Why have there been so many certificates issued over the last year?
Why doesn't it need to be inspected? Because the tonnage has been lowered.