Pacific Coast Marine: Trusted technology, tested at sea. Pacific Coast Marine began building its reputation over 20 years ago by supplying rugged and very high quality marine closures for the North Pacific and world wide work boat fleets. PCM now is the largest supplier of high quality marine doors, windows and hatches in the world. Applications include megayachts, cruise ships, ocean tugs, ocean crew boats, offshore oil platforms, military vessels, fast ferries and merchant ships. The marine environment demands the very best, and that is PCM.