Please refer to the following for details on:
Tonnage of vessels is determined in accordance with the Vessel Registration and Tonnage Regulations and TP 13430 - Standard for the Tonnage Measurement of Vessels, either by using:
the Simplified Method of Tonnage Measurement [PDF Version] for monohull vessels,
the Tonnage Measurement of a Simple Multihull Vessel [PDF Version] for simple multihull vessels, or
a duly appointed Tonnage Measurer.