- AeroHydro, Inc.
 - 3D modelling and marine design with relational geometry. - American Bureau of Shipping (ABS)
- Establishes and administers standards for the design, construction, and operational maintenance of marine vessels and structures.
- Anderson Dredging Consulting Ltd.
- Providing expert dredging and hydraulic land reclamation advice.
 Anthony D Bates Partnership
- Dredging and coastal consultant and engineers.- Argonautics Marine Engineering - Sausalito, CA
- Speciaized in marine transportation of heavy and awkward cargoes such as drilling rigs, navy ships, container cranes, etc.
- Arion Systems, Inc.
- Systems and marine engineering consulting firm specialising in telecommunications, marine dynamic analysis, mechanical design, and underwater sensors.
- Art Anderson Associates
- Multidiscipline marine engineering and naval architecture firm.
- British Maritime Technology (BMT)@
- ENC Laboratories
- Business specialising in the chemistry and analysis of seawater, salts, and brine. Offers chemical analysis, purity, and consulting services.
- Gardline Surveys Limited
- International company providing marine geoscience services worldwide.
- Global Maritime
- Global Maritime is a marine, offshore, and engineering consultancy company. Professional staff of engineers and Master mariners offer specialist maritime expertise to oil and gas, legal, shipping, insurance and ports and harbours clients world wide.
- Glosten Associates, Inc.
- Includes naval architecture experience with tugs, barges, research vessels, hydrodynamics, and transportation planning.
- Hart Fenton & Company
- Naval architect and marine engineering consultancy. They provide design, approval, project management, and supervision services to the marine industry.
- Hazman
- Offers risk and hazard management software for marine authorities world wide.
- Intermar Group
- Independent marine consulting firm provides services to the tug/towboat, barge and offshore oil industries.
- J.A. Jacobsen and Associates Marine Surveying and Consulting
- Independent marine surveying and consulting firm addressing all elements of international and domestic trade and transportation.
- Jamestown Marine Services, Inc.
- Offers naval architecture, salvage engineering, diving support and spill response services, as well as 3D computer animations of famous shipwrecks and sinkings.
- Marine Support
- Provides logistics, cranage, procurement, and quayside services.
- Marine Survey Consultants
- Technical project consultants for worldwide operations in marine geology, geophysics, oceanography, survey, and civil engineering.
- National Marine Consultants, Inc.
- Offers marine and cargo surveys for insurance loss adjusting, pre-shipment inspections, and certification services.
- Oceanic Consulting Corporation
- Naval architectural and ocean engineering firm specialising in Marine Performance Evaluation.
- Philmont Associates, Inc.
- Provides naval architect and marine engineering services to shipping and offshore industries.
- Rodds Bay Maritime
- Offers marine consulting and surveying, vessel construction, and salvage operations.
- Sabine Surveyors, Inc.
- Offering marine surveying and consulting.
- Scientific Marine Services
- Including coastal and marine technology.
- Summers Marine Consultants Ltd
- Provides a variety of services, including marine simulation advice and training.
- Vanson Engineering
- Specialises in marine bearing, interior, and hydraulic steering systems.
- Waterside Marine Technology Ltd
- Consultancy for the design, operation, and maintenance of hovercraft, surface effect ships, and other fast marine craft.
- Zentech
- Consulting engineering, naval architecture, structural, and marine software.
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