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For immediate release: June 24, 2005

MDA Adds New RADARSAT Customers

Richmond, B.C. - MacDonald, Dettwiler and Associates Ltd. (TSX: MDA), a provider of essential information solutions, announced today that it has signed two new subscription agreements with RADARSAT network stations, one with a NATO station in Italy and another with a customer in Kazakhstan.

The addition of the new subscriptions increases the number of worldwide RADARSAT network stations to twenty-six. One of the hallmarks of the RADARSAT program is the rapid delivery of time-sensitive essential information to operational users within one to four hours after the data is received by the nearest network station.

RADARSAT information is used internationally by surveillance and monitoring programs that involve activities such as illegal ship detection, disaster assessment and management, and arctic navigation.

About MacDonald, Dettwiler and Associates Ltd. (MDA)

MDA provides advanced information solutions that capture and process vast amounts of data, produce essential information, and improve the decision making and operational performance of business and government organizations worldwide.

Focused on markets and customers with strong repeat business potential, MDA delivers a broad spectrum of earth and space based information solutions, ranging from complex operational systems, to tailored information services, to electronic information products.

MDA employs more than 2,500 people in locations across the United States, the United Kingdom, and Canada. The Company's common shares trade on the Toronto Stock Exchange under the symbol TSX:MDA.

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For more information, please contact:

Wendy Keyzer
MDA External Relations
Telephone: 604-231-2743

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