The ISM, International Safety Management Code for the Safe Operation of Ships and for Pollution Prevention is an international standard for the safe management and operation of ships focused on the protection of the environment and the safety of the crew but also the equipment. This ISM Code is mandatory for vessels that are over 500 gross tonnages.
ISO 9001:2015 specifies requirements for a quality management system which ensures that a company provides products and/or services that meet customer requirements and any applicable statutory and regulatory requirements. The main goal of ISO 9001 is to enhance customer satisfaction. This standard is non mandatory for shipping.
The following material will provide you more information about the differences between ISO 9001 and ISM code: