International Maritime Organisation.
International Mobile Satellite Organisation.
Inmarsat Ltd (formerly International Maritime Satellite Organisation)
International Code of Signals
Integrated Services Digital Network. A digital access network for data and voice, which provides an alternative to the public switched telephone network.
International Safety Management. Refers to the IMO’s International Safety Management (ISM) Code 2002, which provides an international standard for the safe management and operation of ships, and for pollution prevention.
International Telecommunication Union. The lead United Nations agency for information and communication technologies.