Facts and resources for determining tonnage on documented vessels.
The cargo carrying
capacity or "tonnage" of a vessel is a determining factor in whether a boat
qualifies for Coast Guard documentation. Various rules and regulations regarding
the vessel's usage, citizenship requirements, and ongoing documentation
status are also governed by the tonnage capacity. It is noteworthy that a
vessel's tonnage for documentation purposes is determined by measuring a
vessel's dimensions rather than using displacement or weight calculations.
Simplified Measurement Guide - Explains the simplified measurement system as it relates to other forms of vessel measurement.
Marine Safety Center - A link to the U.S. Coast Guard's Marine Safety Center tonnage division.
Measurement Organizations - A list of approved formal measurement companies.
Additional information about vessel documentation regulations and requirements can be found on our Coast Guard Vessel Documentation page.
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