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U.S. Coast Guard to discontinue service from remaining Differential GPS sites
skeezix:
https://content.govdelivery.com/accounts/USDHSCG/bulletins/1e45da7
U.S. Coast Guard to discontinue service from remaining Differential GPS sites
U.S. Coast Guard sent this bulletin at 03/23/2018 02:00 PM EDT
News Release
March 23, 2018
U.S. Coast Guard Headquarters
Contact: Headquarters Public Affairs
Office: (202) 372-4630
After Hours: (202) 603-3281
mediarelations@uscg.mil
Headquarters online newsroom
U.S. Coast Guard to discontinue service from remaining Differential GPS sites
WASHINGTON – The Coast Guard will discontinue broadcasts from its remaining 38 Differential GPS (DGPS) sites over the next three years, completing system reductions that began in 2016.
The staged reduction of the remaining Coast Guard DGPS broadcast sites will begin in 2018 and end with the last broadcast of GPS corrections over medium frequency in 2020.
“The Coast Guard no longer has a mission requirement for DGPS,” said Lt. Cmdr. Michael Patterson, chief of the Aids to Navigation and Positioning, Navigation and Timing Division. “GPS provides sufficient positional accuracy to meet navigation requirements for harbor approaches and to position Federal Aids to Navigation.”
Patterson said other commercial and government GPS augmentation systems are available for GPS users. The observed accuracy of un-augmented GPS increasingly exceeds the 10-meter accuracy requirements for harbor navigation and harbor approaches.
The National Differential GPS system was significantly reduced between 2016 and 2017 with the discontinuance of all 28 of the Department of Transportation inland broadcast sites, all seven U.S. Army Corps of Engineers (USACE) broadcast sites, and 10 U.S. Coast Guard maritime broadcast sites.
Since 2016, the Coast Guard has affirmed that the positional accuracy provided by un-augmented GPS and GPS augmented by the U.S. Wide Area Augmentation System (WAAS) is sufficient to meet Coast Guard mission requirements and navigational requirements for harbor approach.
The Coast Guard will release the specific termination dates for each broadcast site via local notices to mariners.
For more information on the DGPS discontinuance schedule, view the Federal Register Notice.
-USCG-
skeezix:
https://www.federalregister.gov/documents/2018/03/21/2018-05684/discontinuance-of-the-nationwide-differential-global-positioning-system-ndgps
AGENCY:
Coast Guard, DHS.
ACTION:
Notice.
SUMMARY:
The U.S. Coast Guard (USCG) announces the discontinuance of its remaining 38 maritime Differential Global Positioning System (DGPS) sites. The USCG will implement the closures through a phased reduction in service, which will commence in September of 2018, and conclude by September of 2020. These closures will culminate in the complete cessation of the Nationwide Differential Global Positioning System (NDGPS) service. This notice provides the general schedule for the discontinuance of the remaining maritime DGPS sites. Specific site broadcast termination dates will be published via local notices to mariners (LNMs).
FOR FURTHER INFORMATION CONTACT:
If you have questions on this notice, contact CAPT Mary Ellen Durley, Coast Guard, telephone (202) 372-1605 or email maryellen.j.durley@uscg.mil.
SUPPLEMENTARY INFORMATION:
Background and Purpose
The Maritime Differential GPS system was established in the late 1980s to augment the existing GPS signal with accuracy corrections and integrity monitoring. This augmentation signal was broadcast over Medium Frequency from terrestrial broadcast sites. At the time, the publicly available GPS signal was intentionally degraded through Selective Availability (SA), and thus augmentation was necessary to meet minimum requirements for maritime positioning and navigation. Selective Availability was permanently discontinued in 2000, and as system technology has improved, observed positional accuracy for un-augmented GPS consistently meets requirements for harbor/harbor-approach navigation on modern GPS receivers.
On July 5, 2016, the USCG, the U.S. Department of Transportation (DOT), and the U.S. Army Corps of Engineers (USACE) published a notice in the Federal Register (81 FR 43613), which announced that the Nationwide Differential Global Positioning System (NDGPS) would remain operational with a total of 46 USCG and USACE sites available to users in the maritime and coastal regions. Since 2016, the USACE has discontinued 7 sites, and the USCG has discontinued 1 site in Aransas, TX due to storm damage from Hurricane Harvey. Currently, there are only 38 remaining NDGPS sites, all of which are maritime sites.
Discussion
The USCG has continued assessments and outreach affirming that the positional accuracy provided by un-augmented GPS and GPS augmented by the U.S. Wide Area Augmentation System (WAAS) is sufficient to meet its mission requirements and navigational safety requirements for harbor approaches. Because there is no regulatory requirement for the carriage of Differential Global Positioning System (DGPS) equipment, and other GPS augmentation systems such as WAAS are already in prevalent use by marine navigation equipment, the USCG cannot justify further investment to upgrade and maintain the NDGPS system. Additionally, the Coast Guard no longer has a mission requirement for DGPS to position Maritime Aids to Navigation because current Coast Guard policy allows the placement of aids to navigation with un-augmented GPS or GPS augmented by WAAS. Finally, other government and commercial augmentation systems (e.g. WAAS) are readily available to provide GPS accuracy corrections. For these reasons, Start Printed Page 12403the NDGPS system was reduced from the 2015 constellation of 84 sites, to the current constellation of 38 maritime sites. Pursuant to this announcement, the USCG's remaining 38 maritime sites will be discontinued in stages, beginning in September of 2018 and ending in September of 2020.
Timeline of Maritime Sites To Be Discontinued
Termination of the NDGPS broadcast during Fiscal Year 2018 is planned to occur at the following sites. Specific broadcast discontinuance dates for each site will be announced via Local Notices to Mariners (LNMs) 60 days in advance of the termination of the NDGPS broadcast.
* Annapolis, MD
* New Bern, NC
* Robinson Point, WA
* Pigeon Point, CA
* Bobo, MS
Termination of the NDGPS broadcast at the following sites is planned to occur in Fiscal Year 2019.
* Whidbey Island, WA
* Appleton, WA
* Fort Stevens, OR
* Cape Mendocino, CA
* Lincoln, CA
* Point Loma, CA
* Kokole Point, HI
* Upolu Point, HI
* Driver, VA
* Kensington, SC
* Cape Canaveral, FL
* Card Sound, FL
* Tampa, FL
* Wisconsin Point, WI
* Mequon, WI
* Upper Keweenaw, MI
* Cheboygan, MI
* Detroit, MI
* Youngstown, NY
Termination of the NDGPS broadcast at the following sites is planned to occur in Fiscal Year 2020.
* Penobscot, ME
* Acushnet, MA
* Hudson Falls, NY
* Moriches, NY
* Sandy Hook, NJ
* English Turn, LA
* Angleton, TX
* Annette Island, AK
* Biorka, AK
* Kenai, AK
* Kodiak, AK
* Gustavus, AK
* Potato Point, AK
* Level Island, AK
General information regarding the NDGPS Service and graphics depicting the proposed changes to NDGPS coverage are available at the USCG's NDGPS General Information website at: http://www.navcen.uscg.gov/?pageName=dgpsMain.
For more information on the NDGPS outages and broadcast termination dates, visit the USCG's website at https://www.navcen.uscg.gov/?pageName=dgpsSiteInfo¤tOutages.
Additional information on GPS, NDGPS, and other GPS augmentation systems is also available in the 2017 Federal Radionavigation Plan, which is published by the Department of Defense, Department of Homeland Security, and U.S. DOT, and is also available at the USCG's website at http://www.navcen.uscg.gov/?pageName=pubsMain.
Authority: This notice is issued under the authority of 5 U.S.C. 552(a) and 14 U.S.C. 81.
Issued in Washington, DC, on March 14, 2018.
Michael D. Emerson,
Director of Marine Transportation Systems, U.S. Coast Guard.
[FR Doc. 2018-05684 Filed 3-20-18; 8:45 am]
BILLING CODE 9110-04-P
skeezix:
From the District 5 Local Notice to Mariners :
August 2018: 32-18 1st Weekly Edition
--- Quote ---In accordance with the DGPS Discontinuance Federal Register Notice, the following DGPS site will cease broadcast on 30 September 2018.
Annapolis, MD
New Bern, NC
Robinson Point, WA
Pigeon Point, CA
Bobo, MS
LNM: 32/18
--- End quote ---
From District 8 LNM 32/18:
--- Quote ---DGPS SITE BOBO, MS. - TO BE DISESTABLISHED
Effective September 30, 2018, DGPS Site Bobo, Mississippi, will cease transmission.
--- End quote ---
From District 13 LNM 32/18:
--- Quote ---WASHINGTON – Discontinuance of DGPS signal
In accordance with the DGPS Discontinuance Federal Register Notice, the termination of the DGPS signal at the Robinson Point, WA, location will occur on 30 Sep 18. The dates of termination of signal at other sites are still to be determined and will be published when known.
--- End quote ---
District 11 did not have a notice of Pigeon Point in LNM 23/18 through 32/18.
ChrisSmolinski:
Thanks for posting the list.
All of those come in very well here except for Robinson Point, WA which is blocked by one of those pesky NDB stations, I only have a few very dubious decodes of it. I'd like some of them to get shut down. But without them, how will the biplanes find their way to the local airport?
Guess I will record all day, to catch them going SK.
skeezix:
--- Quote from: ChrisSmolinski on August 07, 2018, 1933 UTC --- I'd like some of them to get shut down. But without them, how will the biplanes find their way to the local airport?
--- End quote ---
Plot MW BC stations on their charts. Not for IFR, but works great for VFR, and entertaining too.
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