News Release   March 30 2004 Offshore Systems International Ltd. notice of conference call Vancouver, Canada -- Offshore Systems International Ltd. (OSI) (TSX: OSI, OTCBB: OFSYF) will release its first quarter 2004 financial results after the close of markets on Monday April 5, 2004, and will host a conference call on Tuesday April 6, 2004. John Jacobson, President and Chief Executive Officer of OSI, will review the company’s financial and operating results for the first quarter ended February 29, 2004, provide an update on its strategic objectives and review operations. A question and answer session will follow, at which time the operator will direct participants as to the correct procedure for submitting questions. You are invited to join the conference call on Tuesday, April 6, 2004 at 11:00 a.m. Eastern Time (8:00 a.m. Pacific Time) by calling 416-405-9310 in Toronto or 1-877-211-7911. Please call in prior to the scheduled start to secure a line; you will then be put on hold until the call begins. A taped replay of the conference call will be available until April 13, 2004 at 11:59 p.m. Eastern Time by calling 416-695-5800 in Toronto or 1-800-408-3053, passcode 3029261. A live audio webcast of the conference call will be available at OSI’s website at www.osil.com. Please connect at least 15 minutes prior to the conference call to ensure adequate time for any software download that may be needed to hear the webcast. Following the meeting, the webcast will be archived at www.osil.com for approximately 90 days. 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 defense, 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