Federal Register: January 7, 2010 (Volume 75, Number 4)

DOCID: fr07ja10-50 FR Doc 2010-83


Coast Guard

Docket ID: [Docket No. USCG-2009-0299]


DOCID: fr07ja10-50



Terminate Long Range Aids to Navigation (Loran-C) Signal

DATES: Transmission of the Loran-C signal and phased decommissioning of the LoranC infrastructure will commence on or about February 8, 2010. All Loran stations are expected to cease transmitting the LoranC signal by October 1, 2010.


On October 28, 2009, the President signed into law the 2010 Department of Homeland Security Appropriations Act. The Act allows for the termination of the LoranC system subject to the Coast Guard certifying that termination of the LoranC signal will not adversely impact the safety of maritime navigation and the Department of Homeland Security certifying that the LoranC system infrastructure is not needed as a backup to the GPS system or to meet any other Federal navigation requirement. Those certifications were made; and the U.S. Coast Guard will, commencing on or about February 8, 2010, implement plans to terminate the transmission of the LoranC signal and commence a phased decommissioning of the LoranC infrastructure. These plans include ending transmissions at 18 Loran stations located in the contiguous United States and 6 Loran stations in Alaska. The Department of Homeland Security anticipates that all Loran stations will cease transmitting the LoranC signal by October 1, 2010.


Terminate Long Range Aids to Navigation (Loran-C) Signal


Background and Purpose

The U.S. LoranC system is a low frequency hyperbolic radionavigation system. A LoranC receiver measures the slight difference in time it takes for pulsed signals to reach a ship or aircraft from the transmitting stations within a LoranC chain to develop a navigational position. LoranC is approved for use in the U.S. Coastal Confluence Zone and as a supplemental air navigation aid. LoranC is operated and maintained by the U.S. Coast Guard.

The LoranC system was a valuable position and navigation system when it was established in 1957. As a result of technological advancements over the last 20 years and the emergence of the U.S. Global Positioning System (GPS), LoranC is no longer required by the armed forces, the transportation sector, or the nation's security interests, and is used only by a small segment of the population.

The LoranC system was not established as, nor was it intended to be, a viable systemic backup for GPS. Backups to GPS for safetyoflife navigation applications, or other critical applications, can be other radionavigation systems, or operational procedures, or a combination of these systems and procedures. Backups to GPS for timing applications can be a highly accurate crystal oscillator or atomic clock and a communications link to a timing source that is traceable to Coordinated Universal Time.

With respect to transportation to include aviation, commercial maritime, rail, and highway, the Department of Transportation has determined that sufficient alternative navigation aids currently exist in the event of a loss of GPSbased services, and therefore Loran currently is not needed as a backup navigation aid for transportation safetyoflife users.

The Department of Homeland Security will continue to work with other Federal agencies to look across the critical infrastructure and key resource sectors identified in the National Infrastructure Protection Plan assessment to determine if a single, domestic system is needed as a GPS backup for critical infrastructure applications requiring precise time and frequency. If a single, domestic national system to back up GPS is identified as being necessary, the Department of Homeland Security will complete an analysis of potential backups to GPS. The continued active operation of LoranC is not necessary to advance this evaluation.

On January 22, 2009 (74 FR 4047), the U.S. Coast Guard began a public review process for its Draft Programmatic Environmental Impact Statement (PEIS), under the National Environmental Policy Act, which evaluated the environmental impacts of several alternatives for the LoranC system, including termination of the LoranC signal. The U.S. Coast Guard considered comments received in response to the Draft PEIS and released a Final PEIS on June 12, 2009 (USCG200728046). A public notice will be issued to announce the Record of Decision.

This announcement is for the purpose of informing the public of the Coast Guard's intention to begin termination of the broadcast of the LoranC signal starting on or about February 8, 2010. All Loran stations will cease transmission by October 1, 2010.

The Department of Transportation was consulted regarding the preparation of this notice. This notice is issued under the authority of 6 U.S.C. 111, 14 U.S.C. 81, and 5 U.S.C. 552.

Dated: January 4, 2009.
Kevin S. Cook,
Rear Admiral, U.S. Coast Guard, Director of Prevention Policy. [FR Doc. 201083 Filed 1610; 8:45 am]


If you have questions on this notice, contact Mr. Mike Sollosi, U.S. Coast Guard, Department of Homeland Security, telephone (202) 3721545, Mike.M.Sollosi@uscg.mil.