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The UK's Largest RTK GPS Network Established for
the Channel Tunnel Rail Link

Trimble GPS used in the Largest Construction Project in the UK

SUNNYVALE, Calif., July 16, 1999 -- Trimble (NASDAQ:TRMB) announced today that its United Kingdom distributor, Survey Supplies, has been awarded the contract to supply the largest Real-Time Kinematic (RTK) network of Global Positioning System (GPS) base stations for the construction of the Channel Tunnel Rail Link (CTRL). The CTRL is the UK's first high-speed train line from London St Pancras to the Channel Tunnel.
The CTRL is being built in two phases. Phase One, which is currently under construction, is from the Channel Tunnel to Fawkham Junction in north Kent. All the main contracts have been awarded, and the work is on schedule for completion in 2003.
Phase Two, due to begin in 2001, will bring the new high-speed line under the River Thames and through east London into St Pancras. Two new stations at Ebbsfleet in north Kent and Stratford in east London will be built.
Once the entire high-speed link is complete in 2007, a journey from London to Paris will take about 2 hours 20 minutes-half the time that it takes to travel from London to the Channel Tunnel today.
The RTK GPS Network
Section One consists of six separate civil engineering contracts awarded to Amec/McAlpine, Balfour Beatty, Eurolink (including Millers), Hochtief/Norwest Holst and Kvaerner. To ensure conformity of the work, a network of six Trimble base stations and three repeaters are being installed along the route, which will be used by all contractors. These stations will ensure that centimeter-level GPS coverage exists over the entire construction site. The project marks the first GPS network in the UK to provide a RTK signal over such a large area.
To work with the network, Rail Link Engineering (CTRL designers and project managers) and the contractors will purchase Trimble GPS Total Station® survey systems. The benefits across the project are already clear in maximizing the staking out hours worked per day and managing the GPS and wireless signal in a controlled and consistent manner.
Survey Supplies, one of Trimble's leading suppliers to the construction and surveying market, will provide and maintain the base stations and ancillary equipment.
Chris Kelly, data manager for Rail Link Engineering said, "For RLE, the critical requirements are for a managed network of GPS base stations which cover the whole route. In addition to this, we also require that the GPS rover equipment and software can transfer the CTRL design data directly to the field for staking out."
"Trimble was chosen because of the flexibility of its software along with the performance of its receivers and controllers. Trimble's GPS Total Station provides a flexible interface to road and rail design packages such as Microstation which has been used previously on the CTRL."
Survey Supplies assisted by Trimble are doing the initiation, provision and support of the base station network. The close proximity of Survey Supplies' Kings Hill - Kent office to the Kent section of the Project, enables the company to offer a high level of local technical expertise as well as around-the-clock support.
Chris Kelly added, "RTK GPS is now the most effective method of staking out, and the permanent base station system provides a controlled environment for the surveyor or engineer to carry out his work. Trimble and Survey Supplies have not only supplied the equipment but worked alongside RLE to provide the GPS solution on the CTRL."
The Channel Tunnel Rail Link
On behalf of London and Continental Railways (LCR) and Railtrack, the responsibility for overall provision of the CTRL lies with two LCR subsidiaries - Union Railways (South) Limited (URS) for Section One, and Union Railways (North) Limited (URN) for Section Two.
Rail Link Engineering (RLE) is designing and managing the construction of the CTRL for URS and URN. RLE is a joint venture set up by the engineering shareholders in LCR - Bechtel, Ove Arup & Partners, Halcrow Group Ltd and Systra.
About Survey Supplies
Established in 1967, Survey Supplies is the UK's largest independent distributor of surveying equipment, software and mapping systems. The company is sole UK distributor of Trimble Land Survey GPS products and Nikon Surveying Equipment and operates through a network of ten offices each offering a sales, hire and repair service.
About Trimble
Trimble is a world leader in designing and developing innovative products enabled by GPS technology. The company provides end-user and OEM solutions for diverse applications including surveying, mapping/GIS, agriculture, construction, mining, military, commercial aviation, automotive, vehicle tracking and timing. Founded in 1978, Trimble now holds more than 200 U.S. patents on GPS and related technology, with over 180 additional patents pending. Located in Sunnyvale, Calif., Trimble has been adding value to GPS since 1984.

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

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