Page 258 - Rules of Navigation2020

(1)
Deductions:
To be made from the Gross Tonnage in order to ascertain the Net Tonnage:
(Art.11) To find from the gross tonnage of vessels as above set forth the official, or net

registered tonnage, either for sailing vessels or for steam ships, the following mode
of operations must be resorted to Sailing Vessels

Sailing Vessels

(Art.12) For sailing vessels deduct : the spaces exclusively and entirely occupied by the crew
and ship's officers, those taken up by the cookhouse and latrines exclusively used

by the ship’s officers and crew whether they be situated above or below the upper
deck; the covered and closed in spaces, if there be any situated on the upper deck,

and used for the helm, the capstan, the anchor gear, and for keeping the charts,
signals and other instruments of navigation.
Each of the spaces deducted as above may be limited according to the requirements

and customs of each country, but the deductions must never exceed in the aggregate
(2)
5 percent of the gross tonnage.

(Art.13) The measurement of these spaces is to be affected according to the rules set forth by
the measurement office of covered and closed -in spaces on the upper deck.

The result, obtained by deducting the total of such allowances from the gross
tonnage represents the net or register tonnage of sailing vessels.

Steam Ship

(Art.14) For vessels propelled by steam or any other mechanical power, deduct:

(2)
A. The same spaces for sailing vessels (Art. 12) with the limitation to five percent
of the gross tonnage.
B. The spaces occupied by the engines, boilers, coal bunkers, shaft trunks of screw

steamers, and the spaces between decks and in the covered and closed-in erections

1 ) Extract from the final report of the International Tonnage Commission assembled at Constantinople in 1873.
It is recommended that a penal provision shall be enacted to the effect that any of the permanent spaces which
have been deducted shall be employed either for the use of merchandise or passengers, or in any way
profitably employed for earning freight, these spaces shall be added to the net tonnage and nevermore be
allowed as a deduction
2 ) Maximum rate was raised to 10% from 1 April 1948.
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