News Release   October 24 2005 OSI awarded $450,000 in additional contracts with Portuguese Navy Vancouver, Canada — Offshore Systems International Ltd. (TSX: OSI/ OTCBB: OFSYF) has been awarded a contract to outfit the Portuguese Navy’s top MEKO class frigates with its warship-version electronic navigation system (‘WECDIS’). OSI was also awarded a second contract for a hardware upgrade to the approximately 30 standard electronic navigation systems delivered under the initial contract in November 2004. The two contracts are valued at approximately $450,000. “This new contract is a good example of follow-on orders we receive from existing customers,” said John Jacobson, President and CEO. “In our experience, new orders from current customers can add up over time to substantial revenue streams. The original contract for the Portuguese Navy included basic commercial ECDIS systems, both hardware and software. These contracts upgrade the Portuguese Navy’s capability to our most sophisticated military system for some of their ships, and to upgraded hardware for the rest.” With partner and prime contractor SICOM – Sistemas de Communições, Lda – OSI is currently fleet supplier to the Portuguese Navy for electronic chart navigation systems. About Offshore Systems International Ltd. Offshore Systems International Ltd. (OSI) makes geographic-intelligence software, systems and data products mainly for large government and civilian customers. The company operates 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 homeland security) and Mapcon Mapping (digital land mapping and marine charting services for civilian customers). Visit 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