(1) All volumes included in the calculation of
gross and net tonnages shall be measured, irrespective of the fitting
of insulation or the like, to the inner side of the shell or structural
boundary plating in ships constructed of metal, and to the outer surface
of the shell or to the inner side of structural boundary surfaces
in ships constructed of any other material.
(2) Volumes of appendages shall be included in
the total volume.
(3) Volumes of spaces open to the sea may be excluded
from the total volume.