Applications supplied by Geocomp Systems: Terramodel, GeoNavGeocomp and iWitness, are protected by Software Licence Authentication keys. These keys are also known as security tokens, devices, keys, locks or dongles.

These keys allow our software to be installed on multiple computers, and be freely backed up, but limit the number of seats (computers running the software simultaneously).

Each USB or parallel-port key contains a chip containing the software modules enabled for that key number. The key is plugged into the computer on your desk or in your hand, unless you use an application like TeamViewer or Citrix to connect to a remote computer that has the software and key installed. Some large organisations have legacy multi-seat server keys which are no longer issued.

If you have or want a key for some other application, contact your local dealer for that application.

Upgrade Codes and files for Terramodel

When the software runs, it reads the key to determine the valid applications, modules, versions, and for demos, number of days. For new Terramodel sales and key swaps, the keys are usually supplied with timed modules. Permanent modules are supplied by email after payment is received. In addition, for the Geocomp Update, we supply a file with key numbers known to have current Customer Care Membership.

Sentinel Drivers for Terramodel

To test whether the key and driver is working, attach the key to the computer, start Terramodel, go to the Help menu and select About and then Products. If that lists “Modules on key”, you do not need to install any newer Sentinel drivers.

Sentinel dongles and drivers are now created by the Gemalto division of Thales.

Recent Sentinel System Driver installers 7.5.9 and 7.6.0 are copied by Geocomp Update M to C:\TMCUSTOM\Geocomp\Alt\Sentinel\Driver Installer and can also be downloaded from Geocomp Systems.

For some obscure reason, Terramodel requires both the USB and parallel port drivers to be installed. Sentinel Drivers 7.5.9 and earlier by default install drivers for both ports. If you install 7.60, select Custom to enable both ports. Windows 10 Enterprise users must install 7.6.0.

You will need administrator privileges to install the drivers.

If you can’t read the key number from the label, select from the help menu, About Terramodel then Products to discover the serial number. The first part of the serial number should match the original number on the label.

We issue our current Terramodel with yellow USB-port keys. If you have a parallel port key, or a faulty key, and have current Customer Care Membership we can replace the key with a newer USB key for free.

To test whether the driver has been installed, what type of Sentinel key and you have whether the hardware is working, use Sentinel Advanced Medic. This is also available from C:\TMCUSTOM\Geocomp\Alt\Sentinel\ and Geocomp Systems.

Keys issued by Geocomp Systems

This table shows which drivers and keys work with each software version, and the link to a source of the drivers, and driver testing and clean up utilities.

SoftwareModel of dongleColour of dongleType of Port / Colour of lightCompany logo or name on original paper label or printed on key (if any)DOS98 SEXPVista7, 8 & 10
Geocomp to 9.07 or GeoNav Office to 3.55Rainbow Sentinel C and C Version ALight greyParallelGeocompNoneNoneN/AN/AN/A
Geocomp to 9.11 or GeoNav OfficeRainbow Sentinel C Version B or CPlusBLight grey or beigeParallelGeocompNoneNoneN/AN/AN/A
Geocomp from 9.13 to 10.2, GeoCalc to 4.1 or GeoNav OfficeRainbow Sentinel C Version B or CPlusBLight grey or beigeParallelGeocompNoneNoneSentinelN/AN/A
Geocomp 10.1 or 10.2SafeNet SentinelBlack & yellowUSB

Green Light
Paydirt DOSRainbow Sentinel ScribeRedParallelPaydirtNoneN/AN/AN/AN/A
Paydirt WindowsRainbow Sentinel SuperProRed or BeigeParallelGeocomp or SpectraPrecision or +3 or TrimbleN/ANoneSentinelN/AN/A
Paydirt WindowsRainbow SentinelPurple, Yellow or Black&yellowUSB

Green Light
Geocomp or TrimbleN/ANoneSentinelN/AN/A
Terramodel DOSRainbow Sentinel ProBeigeParallel+3NoneN/AN/AN/AN/A
Terramodel Field DataNoneN/AN/AN/AN/ANoneNoneNoneNone
Terramodel or VisualizerRainbow Sentinel SuperProRed or BeigeParallelGeocomp or SpectraPrecision or +3 or TrimbleN/ANoneSentinelSentinelN/A
Terramodel or VisualizerSafeNet SentinelPurple, Yellow or Black & yellowUSB

Green Light
Geocomp or TrimbleN/ANoneSentinelSentinelSentinel
Terramodel or VisualizerGemalto SentinelYellowUSB

Red Light
Geocomp label on one side; TRIMBLE printed on the otherN/ANoneSentinelSentinelSentinel
Visualizer demoNoneN/AN/AN/AN/ANoneNoneNoneNone
QuantmSafeNet HASPRedUSBN/AN/ASentinelSentinelSentinel
QuantmSafeNet SentinelBlack & yellowUSB

Green Light
Data Transfer UtilityNoneN/AN/AN/AN/ANoneNoneNoneNone
GeoCalc 4.20NoneN/AN/AN/AN/ANoneNoneNoneNone
None = No driver required
Sentinel = Sentinel driver required
Keylok= Keylok driver required
N/A = Not available

Lost, Stolen or Faulty Dongles

Our policy is to not replace lost or stolen keys, but we may offer to sell you another licence. Consequently, we recommend that you insure your software including your key for the replacement value.

Keys are usually robust and last for many years, however, like any other electronic device, they can fail, sometimes inconveniently, so the application cannot find it anymore. When current versions of Terramodel cannot find a key, there is no Products button under Help About and the only active module is Field Data.

If a key cannot be found, the most common reasons are that the:

  • key is missing
  • key is loose
  • key is confused with similar key also attached to the computer
  • Sentinel System Driver is not correctly installed for both parallel and USB ports
  • Sentinel System Driver is installed when it shouldn’t be
  • Windows is 10 Enterprise and Sentinel System Driver is not 7.60
  • port is faulty, non-standard, not activated in BIOS or not designed to handle keys
  • cable connecting the key to the port is faulty or too long
  • key is faulty
  • key is for different software or a different version
  • key is too old for the operating system
  • key is a parallel port key connected through a USB cable

Faulty keys are usually caused by:

  • connecting zip drives or other tape backup units to the same port at the same time
  • computer-to-computer data transfers through the the dongle
  • a bent pin
  • a worn pin or socket
  • a random or unknown cause
  • fire, water, vehicles or impact

If a key is faulty, we will replace it for free provided:

  • the faulty key is returned to us, and
  • the licence is included in a current Customer Care Agreement

If you anticipate that there could be a time when you need immediate availability of another licence, but don’t want to purchase a licence just for that situation, consider purchasing a HOTKEY for AU$440.00. This is a Terramodel or Paydirt key, plus an activation code for all relevant modules, timed for 10 days. The code is supplied on paper, with the key, and entered by yourself only when you need it.

The fees listed above are for Australian customers and include GST. Customers outside Australia should ask your distributor or ourselves for the local fee.


Our licences are issued with conditions, including restrictions on transfer to other parties. If you have any questions about this matter, please refer to the documentation supplied with the software. Ask us for more information, if required.