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Lydbrook, Gloucestershire, UK, 7th January 2016. Low frequency eLoran transmissions from Anthorn in Cumbria (UK) will continue despite the switch off of the legacy Loran-C transmissions by the French, Norwegians, Danes, and Germans. Signals from the Russian Loran-C equivalent – Chayka – are still available.

Loran watchers saw the signals from all European Loran-C stations except Anthorn cease at 11:00am on Dec 31st, 2015. This meant that – for the time being – a positioning and navigation service is no longer viable in and around the UK. However, it was confirmed to Taviga just before Christmas that Anthorn would continue broadcasting and would not follow suit and be switched off like the others on the 31st December. In fact, Taviga understands that Anthorn transmissions will continue for at least two years providing messaging and precise UTC synchronised time. This action enables the development of a commercial offering that would provide a complementary timing service in the event of jamming or interference to global navigation satellite systems such as GPS and Galileo.

This decision by the UK Government follows closely on the heels of the decision in September 2015 by the US National Executive Committee for Space Based PNT (“EXCOM”) that eLoran “could be a viable nationwide complementary for GPS applications in U.S. critical infrastructure”. The EXCOM is an executive steering group, co-chaired by the Departments of Defense and Transportation, which includes membership from the Departments of State, the Interior, Agriculture, Commerce, and Homeland Security, the Joint Chiefs of Staff, and NASA, and reports directly to the White House. The decision was reiterated in a letter to Congress on December 8th, 2015 wherein the EXCOM agreed “to leverage public and private sector capabilities and resources to support a timing-focused eLoran network, while also documenting the requirements for a more comprehensive complementary PNT capability for the nation’s critical infrastructure”. The continuity of the UK timing service from Anthorn complements US-based Cooperative Research and Development Agreement (CRADA) eLoran timing trials using signals from the former Loran Support Unit located in Wildwood, NJ.

Prof. Charles Curry, co-founder of Taviga and Managing Director of Chronos Technology Ltd, said: “We welcome this important decision by the UK Government which will begin to underpin the service assurance necessary for commercial take-up of a precise UTC synchronised timing service for broadcasting and telecommunications applications amongst others. We have been assessing GNSS vulnerability to jamming, spoofing, space weather, and other forms of interference through our research work at Chronos over the last few years. Whilst there are many ways to mitigate vulnerabilities to GNSS interference, including upgrading existing systems with more robust technology in the receivers and antennas, eLoran provides the only internationally standardised wide area coverage and technically dissimilar radio frequency technology alternative. Our most recent eLoran focused research project is “GAUL” which is on-going and supported by Innovate UK, the UK’s Innovation Agency. GAUL - Galileo Assist Using eLoran - will research the use of the Loran Data Channel to transmit ephemeris data to improve the reception capability of Galileo (and GPS) receivers in challenging locations, such as without a clear view of the sky. GAUL will also transmit localised time corrections so UTC can be received with the same accuracy as transmitted by GPS and Galileo in locations where there is no sky view, such as in buildings and underground.”

Charles Schue, co-founder of Taviga and President/CEO of UrsaNav, Inc., said: “These decisions by the UK and US Governments indicate their concern with overreliance on single sources of PNT from satellite systems. I am pleased that our two countries are taking the lead in acknowledging that all PNT solutions, no matter how good, are vulnerable. They also recognize that the best way to safeguard critical national infrastructure and key resources is to have complementary PNT solutions in place that provide resilient PNT before there is a crisis. The most pressing need is for timing resilience, or assured time. Resilient PNT has a name, and it is eLoran. The future of assured PNT has a name as well, and it is Taviga!”

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About Taviga

Taviga Ltd and Taviga LLC are affiliated companies, both initially co-owned by Charles Curry and Charles Schue. Taviga Ltd ( or will operate with an initial focus on the UK and European markets. Taviga LLC ( will operate with an initial focus on North American markets.

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