Tonnage?

[Cheechako]

Documented tonnage is based on a rectangle of the habitable, volume inside or cargo space if I remember right, is has nothing to do with actual boat weight.... right? or did they change that....

[dansitarz]

The posted information regarding calculations for USCG gross tonnage are correct. However,net tonnage is 80% of gross tonnage is correct only for inboard non-sailing vessels and 90% for sailing vessels with inboard engines. For outboard vessels [whether sailing or cruising type], gross tonnage equals net tonnage [ie. there is no reduction for inboard machinery taking up cargo space]. This is per the USCG Simplified Measurement Tonnage Guide 1, page 9 [TG1-CH2]