CRADA2 Progress Report: New Timing Data Using eLoran

May 26, 2016 -

Our CRADA partnership with the Department of Homeland Security, Science and Technology Directorate (S&T), US Coast Guard (USCG), and Harris Corporation continues to yield very good timing data over long distances using eLoran.

During a presentation at the Institute of Navigation’s Precise Time and Time Interval (PTTI) conference in January, we showed results of using eLoran for timing as captured at several locations, including Leesburg, VA; Washington, DC; Boston, MA; and Bangor, ME. The timing data was gathered during periods in December 2015 and January 2016. A copy of the presentation is available on our website, entitled: “Providing Timing and UTC Service Using eLoran in the United States”.

As part of other on-air periods this year, team members UrsaNav and Harris were able to capture additional timing data, including from a new receiver located in Columbus, OH. This information is now available on our website, entitled “CRADA2 Timing Data Updates”.

Currently, we are using the former USCG Loran Support Unit in Wildwood, NJ as our primary eLoran transmission site. Over the next couple of months, we plan to bring the former Loran-C Station at Dana, IN on line as an eLoran site as well.

Our current timing receiver locations extend as far as 500 miles to the northeast of Wildwood, NJ and as far as 440 miles west. For the next test period, we plan to add timing receivers in Halifax, NS (700 miles); Dana, IN (675 miles); and Ocala, FL (800 miles). This will provide timing data at greater distances and over widely varying terrain.

Stay tuned to our website for ongoing CRADA progress reports. For more information on eLoran, please contact us at

CRADA2 Timing Data Updates – April 2016 (PDF, 808 KB)
ION PTTI – Session P3a – UrsaNav – 27JAN2016 (PDF, 2.6 MB)

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New York Stock Exchange Recap

May 26, 2016 -

A number of people from Department of Homeland Security (DHS), Science and Technology Directorate (S&T), UrsaNav, Harris Corporation, Bloomberg, Department of Treasury (DOT) and a variety of other organizations at the New York Stock Exchange (NYSE) gathered to discuss the importance of precision timing within the financial services industry. As more companies are feeling the pressure from regulators on timing of trades, having precise timestamps down to the nanosecond, are becoming more critical.

Read on to find out what happened at the NYSE:

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UrsaNav demonstrates precision timing technology indoors at the New York Stock Exchange without external antennas using eLoran

April 21, 2016 -
New York Stock Exchange Wall Street Manhattan

April 19, 2016, UrsaNav in partnership with the Department of homeland Security (DHS) Science & Technology (S&T) directorate, US Coast Guard, Juniper Networks and Harris Corporation successfully demonstrated precision timing technology at the New York stock Exchange building on Wall street in the heart of New York City. UrsaNav technology was utilized to successfully demonstrate the power of eLoran for Critical infrastructure protection and to ensure that financial markets can continue to function in the event of a serious GPS disruption. Precise synchronized time is needed in all financial markets to ensure the smooth operation of our financial system and the ability of eLoran to provide a precise synchronized timing reference traceable to UTC without the use of GPS or the need for external antennas provides a powerful combination.

Find the full press release at the link below:

Read the full presentation (PDF, 6 MB)

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Is GPS Jamming the New Normal?

April 5, 2016 -
Space satellite orbiting the earth. Elements of this image furnished by NASA.

April 5th, 2016, Over the past several days, North Korea has “reached across its borders” to jam GPS signals in South Korea. Jamming was first reported in 2010, 2011, and 2012, and has now begun again. Although reports are still coming in, it appears that the impact of the jamming is widespread, affecting maritime and aviation users, as well as mobile communications.

Read More (PDF, 20 KB)

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DHS and UrsaNav Successfully Demonstrate Timing Inside NYSE

March 22, 2016 -
New York Stock Exchange in Manhattan US

On March 8, 2016, UrsaNav, as part of the terms of a Cooperative Research and Development Agreement (CRADA) with the Department of Homeland Security (DHS) Science and Technology Directorate, successfully demonstrated the ability to receive timing signals inside the New York Stock Exchange (NYSE) without the use of an external antenna. This test demonstration was the first step towards a seminar event scheduled for April on Wall Street highlighting the importance of a precise timing service to the financial sector’s critical network infrastructure.

Precise and synchronized timing of financial transactions is critical to markets worldwide and is mandated by regulation in the European Union and increasing requirements in the United States. Today that capability is provided by the satellite-based Global Positioning System (GPS). Recognizing the challenges of space based timing sources, eLoran is consistently recognized as the best candidate to provide a complementary timing solution to GPS. eLoran can provide “trusted time” or “proof of time” for financial, and other critical infrastructure applications within the United States, and abroad.

UrsaNav is uniquely positioned to help achieve the CRADA goals. We provide the world’s most advanced solutions for Low Frequency Alternative Positioning, Navigation, Timing, and Data, including high-performance eLoran Timing Receivers.

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UK-US Joint Venture Heralds New Dawn for Loran

December 3, 2015 -

Press Release

Download a copy of the press release

“Taviga”, challenging the threat of Global Navigation Satellite Systems’ (GNSS) susceptibility to interference and jamming

Lydbrook, Gloucestershire, UK, 3rd December 2015, the founders of Chronos and UrsaNav have formed a new collaboration, known as “Taviga”, to enhance the resilience and reliability of the many economic and business models that depend on space-based timing and positioning services. As good as space-based services are, they are known to have a susceptibility to interference and jamming.

Taviga is the concatenation of parts of the words for Timing and Navigation. The company is focused on the provision of Assured Timing and Navigation to secure our critical infrastructure from cyber and other threats, thereby addressing the growing concern that overdependence on single systems for positioning, navigation, and timing (PNT) makes us vulnerable. Taviga combines the founders’ decades of experience specializing in Low Frequency (LF) PNT technology and industrial timing applications at national and international levels. Its objective is to provide a commercially operated assured LF PNT service.

Charles Curry, founder of Chronos Technology Ltd in the UK, and Charles Schue, founder of UrsaNav, Inc. in the USA, have joined forces to launch Taviga Ltd and Taviga, LLC. Taviga will focus on preserving and establishing LF PNT networks the UK, Europe and the USA using repurposed Loran-C or purpose-built eLoran technology. Taviga anticipates working in partnership with Government Agencies and other entities who have a vested interest in reducing the vulnerability and improving the resilience of critical national infrastructure with a dependency on the Global Positioning System (GPS) and other Global Navigation Satellite Systems (GNSS) sources of PNT.

Charles Curry said: “We have been researching the precise timing capability of eLoran transmissions for over 10 years. During that time, the system has never failed and most impressively it has continued to deliver sub-microsecond time accuracy traceable to UTC in some very challenging locations including deep inside buildings. Our research programme was supported by the UK’s Innovation Agency – Innovate UK through two flagship projects GAARDIAN and SENTINEL. These two projects highlighted the vulnerabilities that threaten GPS signals (and in the future, Galileo) such as jamming, interference and spoofing. They also demonstrated how eLoran is a technically dissimilar source of PNT and not vulnerable to the same types of interference. eLoran is a truly complementary source of PNT ideal for use in critical infrastructure applications that demand precise time and timing such as Telecoms, Broadcasting, Financial Services and Power Utilities.

Charles Schue said: “Every government, academic, and industrial study has resulted in the selection of the LF technology known as Enhanced Loran, or eLoran, as the best wide-area complement to GNSS. There is no doubt that the combination of GNSS and eLoran provides the PNT resilience that most users require. Whether the application is timing/frequency, aviation, maritime, land-mobile, or location based, integrated GNSS-eLoran solutions can provide the proof-of-time and proof-ofposition necessary to safeguard national infrastructure and for business continuity of operations. Additionally, adding eLoran into the PNT mix enables or enhances the capabilities of regional and purpose-built solutions. PNT resilience results from an eco-system made up of layered solutions. Overreliance on a single solution is neither prudent nor safe. It’s time for Taviga.”

Tests have been conducted as part of Innovate UK supported research projects GAARDIAN and SENTINEL, which were led by Chronos Technology Ltd and included UrsaNav’s eLoran receiver engine. eLoran transmissions from the UK, Denmark, Germany, France, and Norway, have consistently demonstrated positioning accuracies of better than ten meters and timing accuracies of less than 100ns in the area of differential eLoran reference sites. Taviga will now seek to engage those governments, and others, in discussions as to how to transition their Loran stations to commercial operation.

Taviga’s goal is the long-term operation of an eLoran system for at least ten years. This length of time provides the necessary service assurance continuity to enable industrial users to invest with confidence in an eLoran-based timing and navigation service that complements their GNSS solutions. As users become accustomed to the additional capabilities and resilience provided with a combined GNSS-eLoran solution, Taviga expects to expand the service footprint into other countries worldwide.

About Taviga

taviga-logoTaviga 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.

Contact Points:


About Chronos Technology Ltd

Fchronos-logoounded by Professor Charles Curry in 1986, Chronos provides time, timing, phase and distribution systems for industrial networks including the communications, energy and finance markets. Chronos also specialises in components and systems for industrial resilient navigation and timing solutions including global satellite systems (GNSS), eLoran transmissions and GNSS jamming detection. For additional information, visit our websites at or

About UrsaNav, Inc.

ursanav-logoUrsaNav, Inc. is the global leader in the provision of LF PNT solutions, whether it be Loran-C or eLoran technology, equipment, and services. Founded in 2004 by Charles Schue, UrsaNav’s personnel have been involved in every technical advance in Loran-C and eLoran technology since the early 1970s, resulting in deep experience in the design, development, and deployment of terrestrial PNT systems. For more information, visit our website at

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UrsaNav Makes the Case for Innovation and eLoran to Protect our Critical National Infrastructure

November 24, 2015 -

A GPS World article authored by UrsaNav, outlines why eLoran and Resilient PNT are critical to the national security of the United States and its allies. We believe that Resilient PNT is a necessary step in protecting critical infrastructure like telecommunication networks, electric grids, and financial networks from cyber-attacks.

Read the full article from GPS World.

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UrsaNav Highlights Sage Advice on eLoran and Resilient PNT

November 13, 2015 -

(photo courtesy of Wikipedia)

A current GPS World article highlights how the United States has an opportunity to regain its leadership in PNT technology by implementing an eLoran system to protect our national critical infrastructure. UrsaNav stands behind, and give much merit to the numerous government studies and reports that have been conducted over the last 15 years and they all point towards a single solution… eLoran. The world is requesting, almost begging for, US leadership on this critical national security issue. We certainly hope that our elected leaders will listen.

Read the full article from GPS World.

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UrsaNav Responds to Plans to Decommission Many Sites of US Nationwide DGPS

November 6, 2015 -

UrsaNav responds to US Department of Transportation request for comment (Docket Number DOT-OST-2015-0105) on the government’s plans to decommission many of the sites of US Nationwide Differential Global Positioning System (DGPS).

We accept and acknowledge the government’s decision to decommission 62 of the current NDGPS sites. We strongly suggest that the government make no immediate plans to dismantle or dispose of these sites because we believe they are a very valuable national resource that could be used for other national services. We believe that many of these sites have the potential of providing precise timing services to Critical US Infrastructure as part of a an eLoran timing service. An eLoran timing service is currently under consideration by the government and many of these sites have the potential to be repurposed as either differential eLoran reference sites or low power eLoran transmitting sites. We also believe that spare technology for these sites at the organizational or depot level (i.e., shelters, generators, antennae, and the like) has the potential to be repurposed.

UrsaNav, Inc. is a strong advocate of resilient PNT. A resilient PNT ecosystem is a logical step in securing our critical infrastructure from GPS disruptions. It also provides industry with an opportunity to create innovative new products and services based on complementary PNT solutions. Each technology in the ecosystem can build on the strengths of others, while reducing the threats caused by the inherent vulnerabilities in every system. We believe that many of the NDGPS sites could be used for multiple purposes, such as a component of an eLoran solution, continuing as part of the CORS network, or for other timing, navigation, or emergency notification services. We request that the government seek input on alternative uses for these sites prior to dismantling equipment or disposing of the sites.

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