News Release   November 08 2005 OSI signs formal agreement to acquire U.S.-based technology supplier to the U.S. Department of Defense; acquisition will significantly increase OSI’s size and market presence Vancouver, Canada — Offshore Systems International Ltd. (TSX: OSI/ OTCBB: OFSYF) is pleased to announce that it has entered into a formal agreement to acquire a United States-based defense contracting company. The purchase price will be US$9 million, of which approximately $8.1 million will be paid in cash, with the balance to be paid by the issuance of 1,067,975 OSI common shares. OSI first announced a non-binding letter of intent to acquire the target company on July 11, 2005. The target company reported revenues of approximately US$12 million (unaudited) in 2004 and has shown consistent growth and profitability throughout its history. The company has approximately 80 employees located at three offices in the United States. “We are delighted to have this company join the OSI group,” said Ken Kirkpatrick, the newly appointed President and CEO of OSI. “In business for almost 20 years, this is a very well-run enterprise with a solid, committed management team and superb track record. It represents an excellent fit with OSI and will serve as a key stepping stone as we continue to build the go-to company for geographic technology globally. “The transaction will give OSI a strong corporate presence in the large U.S. defense market,” Kirkpatrick added. “With complementary products and a broad customer base for command and control applications within the U.S. defense community, we expect the acquisition to be highly accretive. From a strategic viewpoint, we believe this will set the stage for OSI to expand in critical mass and broaden its market access to pursue much larger-scale contracts.” The acquisition is expected to be completed by the end of 2005. Closing is subject to receipt of regulatory approvals and satisfaction of certain conditions. About OSI Offshore Systems International Ltd. (OSI) makes geographic-intelligence software, systems and data products mainly for large government and civilian customers. The company has three business units: OSI Navigation Systems (moving-map display systems and software for naval surface ships and submarines); OSI Applications (network-based map and target display software and services for national defence) and Mapcon Mapping (land mapping and marine chart production services for civilian and military customers). Visit OSI’s website at www.osil.com for the latest company updates. Forward-Looking Statements This news release contains items that 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. 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. Offshore Systems International can give no assurances that its representations will be achieved or that it will update them at any time in the future.   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