GPS Information


The Geology & Geophysics Department, in cooperation with EGI and the Dean of the CMES, have been able to acquire a Trimble 4700 Total Station RTK & Post-Processing GPS bundle. This equipment is capable of real-time kinematic (RTK), post-processed kinematic, and (rapid) static GPS surveying. In RTK mode, with a baseline distance of 10 km or less, the system can achieve accuracies of (much) better than 10 cm vertically and 8 cm horizontally. Used in a static campaign mode, the equipment is capable of geodetic quality - accuracies better than 1 cm vertically.

Using the equipment

Anyone from Geology & Geophysics, EGI, or CMES doing research or official work is allowed to use the equipment. To reserve the equipment, use the forms below. The equipment is reserved on a first-come, first-served basis. To pickup or return the equipment, come to WBB 709/710 to get a key to the storage room.

It is recommended that anyone using the equipment first have an introduction to the system by someone familiar with its operation.

There is an equipment checklist (see links below) that lists the items you should receive when you pick up the system, and what you should give back when you are done. The list is organized by transport container, but this is not necessarily the optimal packing for field work.

The "Usage Notes" listed below are a collection of small notes written by previous operators. They are not necessarily universally applicable, but provide some hints as to what to expect. In particular, they cover some of the limitations of the system that are poorly covered or missing from the manuals. The notes also include many warnings of errors to avoid, most of which will damage the gear (which users are responsible for repairing).


To download the GPS, it is necessary to use Trimble's Geomatics Office or the software on the TSC1 CD. This software only runs under Windows 9x/NT/2000. An installed copy of the software is available for use in the Thermal Geophysics Group; please contact for access. Work is underway to reverse engineer the protocol, which Trimble refuses to release, to create a Java download program.

Last modified