News Release   Aug 30 2004 OSI announces $1.2 million contract award for the Royal Australian Navy's new patrol boats Vancouver, Canada — Offshore Systems International Ltd (OSI) (TSX: OSI / OTCBB: OFSYF) announced today that it has agreed with Nautronix Ltd, the Australian prime contractor to the Royal Australian Navy (RAN), for the supply of additional ECPINS-M systems to the RAN. Twelve ECPINS-M systems have been purchased for installation on the RAN’s ARMIDALE Class of new patrol boats to be constructed by Austal Ships, of Henderson in Western Australia. The value of the contract is in excess of $1.2 million. In March 2004, OSI was successful in the award of a contract by Nautronix for the delivery of software licenses, hardware systems and installation support for the RAN fleet. This new acquisition is being handled separately by the Australian Department of Defence and represents the last step in ensuring ECPINS-M becomes the standard for the RAN. “We are very pleased that the Australian Department of Defence, through Austal Ships, has decided to proceed with this purchase,” said John Jacobson, President and CEO of OSI. “OSI has worked very hard to ensure the program is a success and this additional order confirms the excellent progress we have made to date. OSI looks forward to working with Nautronix and Austal Ships to deploy ECPINS-M systems across this new class of vessel within the RAN fleet.” 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