Imo publications carried onboard ? is ISM code publication compulsory ?

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SOLAS - International Convention for the Safety of Life at Sea -
Chapter V - Safety of navigation - Regulation 21

Regulation 21 - International Code of Signals and IAMSAR Manual
1. All ships which, in accordance with the present Convention, are required to carry a radio installation shall carry the International Code of Signals as may be amended by the Organization. The Code shall also be carried by any other ship which, in the opinion of the Administration, has a need to use it.

2. All ships shall carry an up-to-date copy of Volume III of the International Aeronautical and Maritime Search and Rescue (IAMSAR) Manual.
 
Regulation 27 - Nautical charts and nautical publications
. Nautical charts and nautical publications, such as sailing directions, lists of lights, notices to mariners, tide tables and all other nautical publications necessary for the intended voyage, shall be adequate and up to date.