DULLES, Va., May 29, 2002 /PRNewswire-FirstCall via COMTEX/ --

Company's Internet-Based ORBTRAC.COM System to Track and Manage County's Fleet of Highway Maintenance Vehicles

Orbital Sciences Corporation (NYSE: ORB) announced today that Waukesha County, Wisconsin has selected the company's ORBTRAC.COM system to help track and manage a portion of the County's fleet of highway maintenance vehicles. The planned roll-out of the system calls for immediately equipping 56 County snow plows with in-vehicle units and completing the installation of additional units in the remaining 150 highway maintenance vehicles in 2003. Financial terms of the contract were not disclosed.

"Orbital's system will help us to better manage snow removal and other maintenance activities throughout the County. The ability to track and manage our fleet online will help streamline our operations and reduce the cost of winter road maintenance while increasing the safety and mobility of our residents," said Mr. Steve Geiss, Field Operations Manager for Waukesha County Department of Highways.

The ORBTRAC.COM system represents the latest technology in vehicle fleet management for government public works organizations. The Internet-based system is fully integrated, using real-time satellite-delivered Global Positioning System (GPS) information and two-way mobile communications capabilities. It provides the capability to track vehicle location and status, as well as to identify sections of roadways that have been serviced. Orbital's system also provides post-service analysis tools to help customers improve the efficiency and reduce the cost of future operations.

Orbital's newly designed touch-screen Mobile Data Terminal (MDT) will be installed in Waukesha County vehicles for use by the operator to communicate with the control center, transfer data and monitor vehicle equipment status. Orbital's system will also incorporate the County's existing wireless communications infrastructure for vehicle-to-dispatch communications.

Mr. David L. Mathisen, Vice President and General Manager of Orbital's Transportation Management Systems (Orbital TMS) division said, "ORBTRAC.COM represents the next generation of Automatic Vehicle Location products. With the simplicity of Internet access and touch-screen interfaces, ORBTRAC.COM offers a streamlined approach to fleet management. We are very excited about working with Waukesha County and look forward to implementing the system."

About Orbital TMS:

Orbital TMS is the country's leading supplier of satellite-based Automatic Vehicle Location (AVL) systems for the expanding Intelligent Transportation Systems market. Orbital's AVL systems are used by 55 public transit and state agency customers in the U.S. and abroad, with units installed, or scheduled for installation, on approximately 25,000 vehicles. Orbital TMS generates annual revenues of approximately $70 million and employs over 200 people at its facility in Columbia, Maryland.

More information about Orbital TMS can be found at http://www.tms-online.com

About Orbital:

Orbital is one of the world's leading developers and manufacturers of affordable space systems for commercial, civil government and military customers. The company's primary products include low-orbit, geosynchronous and planetary spacecraft for communications, scientific and remote sensing missions; ground- and air-launched rockets that deliver satellites into orbit; and missile defense boosters that are used as target and interceptor vehicles. Orbital also offers space-related technical services to government agencies and develops and builds satellite-based transportation management systems for public transit agencies and private vehicle fleet operators.

    More information about Orbital can be found at http://www.orbital.com
CONTACT: Barron Beneski, Public and Investor Relations of Orbital Sciences Corporation, +1-703-406-5528, or Beneski.barron@orbital.com .

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SOURCE Orbital Sciences Corporation

CONTACT:          Barron Beneski, Public and Investor Relations of Orbital
                  Sciences Corporation, +1-703-406-5528, or Beneski.barron@orbital.com

URL:              http://www.orbital.com
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