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Trimble Inc.
935 Stewart Drive
Post Office Box 3642
Sunnyvale, CA 94085
1.408.481.8000 phone
1.408.481.7781 fax


Trimble Expands GPS Infrastructure Solutions

Trimble Introduces the Next Level in
Positioning-Long-Range RTK

SALT LAKE CITY, Sept. 20, 2000 -- Trimble (NASDAQ:TRMB) announced today a new solution for Global Positioning System (GPS) infrastructure, the Virtual Reference Station (VRS). The VRS enables centimeter-level positioning without the need to set up a local reference station. Now users can achieve long-range, real-time kinematic (RTK) precision over greater distances via wireless communications in the field.

The announcement was made today at Institute of Navigation GPS 2000 Conference.

The VRS, developed by Spectra Precision's subsidiary TerraSat, consists of software and a network of Trimble GPS receivers communicating with a control center. The VRS software uses the data to calculate GPS error corrections that are applicable over a wide area. These error corrections are transmitted via wireless communication devices (radios or cellular phones) to users in the field within the network area. Additionally, users can retrieve stored GPS correction data from the control center via the Internet for postprocessing.

VRS technology overcomes previous limitations with high precision GPS. The system significantly reduces systematic errors in the reference station data to improve reliability and operating range. This allows a user to increase the distance at which the rover receiver is located from the physical reference stations while improving on-the-fly (OTF) initialization times. Traditionally, for precise GPS applications-surveying, construction, precision farming and high accuracy Geographic Information System (GIS)-roving receivers required a reference station within 10 kilometers to ensure centimeter level accuracy. With VRS, users can operate at distances up to 50 kilometers without degrading accuracy-at least 3 times greater than before.

About Trimble GPS Infrastructure

GPS Infrastructure consists of reference stations (single or networked) and application software that enables users to determine their position at various levels of accuracy in either real-time or through post processing. Trimble and Spectra Precision provide complete GPS infrastructure solutions-hardware, software, integration and support.

For more than a decade Trimble products, including reference stations, mobile GPS receivers, application specific software packages and systems, have been providing users with reliable, real-time DGPS and RTK positioning and navigation solutions as well as high precision GPS data for postprocessing. Trimble solutions are at the core of more than 150 DGPS infrastructure systems in 20 countries.

About Trimble

Founded in 1978, Trimble is a recognized worldwide leader in the development of innovative Global Positioning System (GPS) technology-based products for a wide range of applications. Today, these advanced solutions combine GPS with wireless communications and sophisticated software to meet demanding applications in markets ranging from agriculture and construction to asset management, automotive and timing. Headquartered in Sunnyvale, Calif., Trimble provides end-users and OEMs with leading edge solutions backed by global leadership in innovation, exceptional experience and in depth applications knowledge as well as a reputation for excellence.

With its acquisition of Spectra Precision, a leading provider of construction lasers, machine control systems, optical surveying instruments and related software, Trimble now broadens its portfolio of positioning solutions for the engineering and construction, and agriculture markets.

Media Contact:    LeaAnn McNabb of Trimble: 408-481-7808

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