# The Merchant Shipping (Cargo Ship Construction) Regulations 1997, Regulation 15: Subdivision indices

Extent: E+W+S+N.I.

(1) The attained subdivision index of every ship shall not be less than the required subdivision index of that ship.
(2) The attained subdivision index of a ship is the value “A” calculated in respect of that ship in accordance with the formula specified in paragraph 3 of Annex I in Merchant Shipping Notice No. M.1715 (M) and the required subdivision index for a ship is the value “R” calculated in respect of that ship in accordance with the formula specified in paragraph 2 of Annex I to that Notice.
(3) In calculating “A” and “R” account shall be taken of the explanatory notes set out in Annex II to that Merchant Shipping Notice.

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Source: https://www.legislation.gov.uk/uksi/1997/1509/regulation/15 (the official version)
Page: https://openlegislation.uk/merchant-shipping-cargo-ship-construction-regulations-1997/regulation-15
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.