Concerns safe operation of ships and pollution prevention. ISM is mandatory under the International Convention for Life at Sea. It applies to: passenger ships (including high speed craft), ro-ro passenger ships, oil tankers, chemical tankers, gas carriers, bulk carriers of 500 gross tonnage or above, high speed cargo craft of 500 tonnage or above, cargo ships and mobile offshore drilling units of 500 tonnage or above. The ‘Company’ (shipowner, manager or bareboat charterer) must establish and implement a safety management system and obtain a Document of Compliance (DOC) every five years that is also audited annually. Non-compliance means automatic termination of the hull and machinery policy (Clause 13 International Hull Clauses). Policies usually protect the interests of innocent mortgagees for a limited period. See INTERNATIONAL SAFETY MANAGEMENT CODE ENDORSEMENT.