News Release   June 27 2005 Canadian Navy a global leader with OSI’s electronic chart navigation system, making it a technological leader in “paperless” navigation -- Among 160 vessels attending largest-ever International Fleet Review in UK, HMCS Montreal one of the only ships with advanced electronic navigation capability Vancouver, Canada -- Offshore Systems International Ltd. (TSX: OSI/ OTCBB: OFSYF) said today that the Canadian Navy can stand among the best of them when it comes to having the most advanced technology in the world for navigation. In fact, the Canadian Navy is leading the world in “paperless” navigation, which is one of the most revolutionary changes in naval history for how ships navigate and conduct operations. “It might sound pretty basic, but there is nothing more important than knowing where you are and where you’re going, especially when you’re talking about billion dollar warships,” said John Jacobson, OSI President and CEO. “Even in the 21st century, navies are having ships run aground because they lack accurate information or technology. And believe it or not, most of the major navies around the world are just beginning the transition from traditional paper chart navigation to electronic systems.” Not the Canadian Navy, however, which has more ships with electronic chart navigation systems installed, replacing traditional paper charts, than pretty well any other country in the world (with more than 50 vessels fleet-wide), and more vessels that could be classified as “paperless” (with more than six). “This is pretty significant and not too many Canadians are aware of our Navy’s leadership in this area,” Jacobson said. “The Royal Navy, which signed up for our system last year, heralded electronic chart navigation as an important step forward in the history of the British Navy’s navigation. In fact, they acknowledged that it’s the first time the navy has changed how it navigates since 1795.” So why is this important? In really simple terms, you could compare it to navigating in your car with a road map, or navigating with the latest global positioning system. But in this case, you’re a submarine at the bottom of the ocean, or an aircraft carrier in the Arctic, part of a fleet or coalition combat operation, and all you have is a paper chart. Or you have the most advanced electronic chart navigation system. Now, paper charts can all be electronic; they are interactive; and they are in real-time, meaning information is constantly updated as a ship progresses. Also, electronic charts provide much more detailed information than can be supplied by a paper chart. Many streams of information can be merged into a single computerized display – everything from radar, sonar, satellite – you name it, all of the numerous, diverse and complex information feeds that tell a ship where it is, where it’s going, what’s around it, what’s in the way, and what time it will get there. A critical added benefit of OSI’s electronic chart systems, however, is their ability to improve the operational capability of a ship. In addition to all of the functionality for precise navigation, they have tactical tools for more accurate weapons management, complex maneuvering as part of a naval task group, as well as mission planning and execution. “We’re talking truly state-of-the-art,” said Jacobson. “The detail and range of information is unparalleled. Whether it’s identifying troops on shore, hostile aircraft flight paths, the location of hidden submarines, or submerged continents – our system can provide a highly accurate electronic picture of a ship’s surroundings and its part in a naval task force.” OSI delivered the first electronic chart navigation system to the Canadian Navy as far back as 1985. Fleet installations began in 1997 and continued in 2001. They were one of the first to initiate development work for submarine navigation, and are one of the only countries globally with a submarine system installed and sea trials underway. Training facilities for “paperless navigation” are in place across Canada at all of the navy’s training schools. This is one of the most advanced fleet and training-school implementations of electronic chart navigation systems in the world. “The Canadian Navy deserves a lot of credit for their vision,” said Jacobson. “They were one of the first to deploy a surface vessel with electronic chart navigation, the first to use an electronic chart navigation system for sub-surface navigation, and the first to use it to pipe the bridge’s navigational picture into the operations room.” Jacobson said he believes the Canadian Navy’s technological leadership deserves recognition. At a major International Fleet Review event in Portsmouth hosted by the Royal Navy to celebrate maritime heritage and achievement, with more than 160 vessels from 35 countries attending, Canada will be represented by the HMCS Montreal. “It will be one of the only warships present with the most advanced electronic chart navigation system in the world, and the only one that could be classified as ‘paperless’. This is a significant achievement for Canada when you consider the size and scope of other international navies.” OSI is the leading supplier of electronic chart navigation systems and software for navigation and situational awareness to NATO and its close allies. In addition to the Canadian Navy, OSI is fleet supplier to the navies of Australia, Denmark, New Zealand, and Portugal. Notes to Editors The International Fleet Review is part of Trafalgar 200 to celebrate the 200th anniversary of the Battle of Trafalgar. The Royal Navy is hosting about 160 vessels from 35 nations on June 28th for the Review, the largest ever and first one since 1977 in a tradition dating back 600 years. The HMCS Montreal will participate in the event, which includes a review by Her Majesty the Queen, sail and flypasts, a re-enactment of a 19th century battle and fireworks. More information is available at www.trafalgar200.com. OSI is the only one in its field to win five consecutive international open procurements and the only supplier with more than one fleet customer. Today, in addition to the Canadian Navy and Canadian Coast Guard, OSI counts among its customers the UK’s Royal Navy, the Royal Australian Navy, the Royal New Zealand Navy, the Portuguese Navy, the Royal Danish Navy, the US Navy, US Coast Guard, Teekay Shipping, and Canada Steamship Lines. OSI’s electronic chart navigation system is installed or under contract for installation on more than 340 major warships globally. In addition to being the dominant supplier to NATO and its allies, OSI is the leading supplier to the Great Lakes commercial fleet as 80 per cent of all vessels carry an OSI electronic chart navigation system. In the confined waters of the Great Lakes, the company’s system helps to reduce the risk of navigation-related incidents. According to a Transport Canada study, navigation-related marine incidents dropped by 75 per cent between 1995 and 1997 in the St. Lawrence Seaway and Great Lakes system. About Offshore Systems International Limited Offshore Systems International Ltd. (OSI) makes computer-based geospatial 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 (digital map data production services for civilian customers). OSI’s common shares are listed for trading on the Toronto Stock Exchange (TSX: OSI) and the OTC Bulletin Board (OTCBB: OFSYF). Visit OSI’s website at www.osil.com for more information and 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 actualresults 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