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New Firmware update released for DM24 Mk3 digitisers to address GPS Week Number Roll Over (WNRO) issue

DM24 Mk3 Firmware Update

We can confirm that a firmware update for the DM24 Mk3 digitiser is now available. In addition to addressing the 2019 Week Number Roll Over issue, this patch will also address the future 2038 Week Number Roll Over.

This update will apply to:

  • DM24 Mk3 digitisers*
  • DM24S3EAM and DM24S6EAM data acquisition units
  • All DM24-based digital instruments manufactured since 2005

*PLEASE NOTE:This update will not apply to a small number of peli-cased DM24 Mk3 units with a USB socket under the lid. If you are unsure if you have one of these systems, please contact and they will be able to assist you.

Full instructions for downloading and applying the firmware update are on the DM24 WNRO update page of our website here.

We are not able to provide a GPS firmware update for CD24 digitisers, DM24 Mk2 digitisers or the corresponding integrated instruments

For both of these types of systems we advise a GPS hardware upgrade as the best solution.
We are still advising the GPS receiver hardware upgrade as the best solution. In addition to addressing the 2019 NWRO issue, the new hardware will deliver additional benefits such as:
  1. Improved, automatic leap-second support.
  2. Field upgradeable for future-proof operation
  3. Unlike earlier versions, it can be used interchangeably with DM24 and CD24 equipment with the use of adaptor cables
  4. More channels. The new receivers support 56 channels, compared to 12 for the Trimble iQ or 8 for the Trimble SQ modules.
  5. Faster start-ups
Further advice for the GPS NWRO issue including hardware upgrade and firmware update information can be viewed on our GPS WNRO page.
The Affinity, Minimus(+) and Fortimus are not affected by the 2019 WNRO.
To request more information please email

The Güralp Support Team



For urgent enquiries please call 020 3727 1000 and speak to Fergus Wheeler, Louisa Feltes or Jess Gill. 




Güralp Systems Ltd.( is a leading global provider of sophisticated seismic monitoring solutions used to understand natural seismological events such as earthquakes, aftershocks and volcanos, as well as induced seismic events, or seismic signals, resulting from human activity.

Our solutions are used in research, civil and industrial applications to increase understanding, optimise processes and to protect people and the environment. Our equipment is installed in all major ocean basins and across all continents worldwide.

Our instruments range in performance from very low frequency, very low noise for global seismology to high dynamic range instruments for local, strong motion monitoring. Our sensors and can be supplied for deployment at the surface, in boreholes and on the ocean bottom. We also provide data acquisition equipment, power and communication accessories and data interpretation software.

Our services include installation and commissioning; network operation; repair and maintenance services; data processing and interpretation.

Headquartered in Reading, in the UK, we have been operating for more than 30 years and have established a global network of distributors who provide local customer support and sales services.





Guralp Systems Limited
Midas House
Calleva Park

Tel: +44 118 981 9056
Fax: +44 118 981 9943