News Release   May 20 2004 OSI's COP-IDS™ to be used in Joint Warrior Interoperability Demonstration Vancouver, Canada -- Offshore Systems International Ltd (OSI) (TSX: OSI / OTCBB: OFSYF) announced today that the Canadian Department of National Defence has invited the company to demonstrate the company's newest product, COP-IDS, as part of the Joint Warrior Interoperability Demonstration ("JWID") event hosted by the U.S. Chairman of the Joint Chiefs of Staff. JWID is an annual event that enables U.S. combatant commands and the international community to investigate command and control, communications, computer, intelligence, surveillance and reconnaissance ("C4ISR") solutions in a simulated war-fighting environment. Coalition participants include Canada, Australia, New Zealand, United Kingdom and other NATO members. Coalition partners like Canada conduct their own interoperability trials and assessments at operating sites around the world, and exchange information with other commands across multiple domains. This year's event will take place during June and the theme is "Forging New Coalitions", featuring interoperability and collaboration on network-centric warfare. COP-IDS™ will provide the server platform which extracts simulation data regarding location and movement of Canadian forces, allies, threats and non-combatants, combines it with current land and marine mapping data, and distributes a network-based Common Operational Picture ("COP") to end users and other demonstrating application providers. "We are very proud to become a part of Canada's efforts at JWID," said John Jacobson, Chief Executive Officer of OSI. "The feedback from other technology providers who integrate with COP-IDS™, and from the end users who see our common operational picture, will be important as we refine the technology and pursue new applications within military command and control." "JWID provides countries such as Canada with a dynamic opportunity to trial and test new and emerging C4ISR technologies like COP-IDS™ using a realistic, real-time war fighting scenario," said Canadian JWID national lead Major R.E. Kearney of the Canadian Forces Experimentation Centre. "These products receive unparalleled exposure to our own forces and command as we develop solutions to interoperability problems nationally, and also with Canada's principal allies who experience similar concerns and are seeking to dramatically improve situational awareness and safety for all forces." The 2004 event will welcome new JWID partners including the U.S. National Guard Bureau, U.S. Department of Homeland Security, U.S. Coast Guard and Canadian Department of Public Safety and Emergency Preparedness. About Offshore Systems International Ltd. Offshore Systems International Ltd. (OSI) is a leader in electronic geography. The company’s core strengths lie in the ability to produce, manage and display many forms of geographic data. The company provides display systems and data for several defence, government and commercial customers. OSI conducts its operations through three business units: OSI Geomatics (data production and distribution), OSI Navigation Systems, and OSI Applications (products and services for command and control systems). OSI’s common shares are listed for trading on the Toronto Stock Exchange (TSX:OSI) and the OTC Bulletin Board (OTCBB: OFSYF). For more information please visit www.osil.com. Forward-Looking Statements This news release contains discussion of items that may constitute forward-looking statements within the meaning of securities laws including Section 27a of the Securities Act of 1933, as amended, and Section 21e of the Securities Exchange Act of 1934, as amended, with respect to achieving corporate objectives, developing additional project interests, OSI’s analysis of opportunities in the acquisition and development of various project interests and other matters. These statements are made under the ‘safe harbour’ provisions of the Private Securities Litigation Reform Act of 1995 and, as such, involve known and unknown risks and uncertainties and other factors that may cause the actual results to be materially different from the results implied herein. Although Offshore Systems International believes the expectations reflected in such forward-looking statements are based on reasonable assumptions, it can give no assurances that its expectations will be achieved. Factors that could cause actual results to differ from expectations include the effects of general economic conditions, changing foreign exchange rates, actions by government authorities, uncertainties associated with contract negotiations, and industry supply.   For more information contact: Jane Hayward Investor Relations +1 613 287 0462 or +1 888 880 9797 +1 613 287 0466 (FAX) invest@osigeospatial.com