Comments Sought on Future User Needs for Nationwide DGPS

April 16, 2013  - By
Image: GPS World

The U.S. Department of Transportation’s Research and Innovative Technology Administration (RITA), in partnership with the U.S. Coast Guard, is seeking public comments on  current and future user needs for the Nationwide Differential Global Positioning System (NDGPS).

The agencies want to know how users use NDGPS, and are seeking ideas for future uses or alternative uses.

According to the notice in the Federal Register,”The NDGPS was designed to broadcast signals to improve the accuracy and integrity of the Global Positioning System (GPS) derived positions for surface transportation, as well as other civil, commercial, scientific, and homeland security applications. This analysis will be used to support future NDGPS investment decisions by the Department of Homeland Security and the Department of Transportation beyond fiscal year 2016. This notice seeks comments from federal, state, and local agencies, as well as other interested members of the public regarding current and future usage of the NDGPS, the need to retain the NDGPS, the impact if NDGPS signals were not available, alternatives to the NDGPS, and alternative uses for the existing NDGPS infrastructure.”

NDGPS is a ground-based augmentation system that provides increased accuracy and integrity of GPS information to users on U.S. land and waterways. The system consists of the Maritime Differential GPS System operated by the U.S. Coast Guard and an inland component funded by the Department of Transportation. NDGPS is built to international standards, and similar systems have been implemented by 50 countries around the world. Modernization efforts include the High Accuracy NDGPS (HA-NDGPS) system, currently under development, to enhance the performance and provide 10-15 centimeter accuracy with integrity throughout the coverage area. For more information about NDGPS, visit the following webpages:

Comments and related material must reach the Docket Management Facility on or before July 15, 2013.

Comments can be submitted identified by docket number USCG-2013-0054 or RITA-2013-0001 using any one of the following methods:

  1. Federal eRulemaking Portal:
  2. Fax: 202-493-2251.
  3. Mail: Docket Management Facility (M-30), U.S. Department of Transportation, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE., Washington, D.C.   20590-0001
  4. Hand delivery: Same as mail address above, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The telephone number is 202-366-9329.

All comments received will be posted, without change, to and will include any personal information provided.

For more details on submitting comments, see the Federal Register notice.

More information on the status of the NDGPS can be found on the RITA site and the U.S. Coast Guard site. More information on the HA-NDGPS is at the U.S. Department of Transportation site.

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