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Old 18-01-2020, 12:04   #1
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Possible GPS outages in South East US This Month

Belleville News-Democrat: Huge military exercise could jam GPS for small planes flying in the Southeast, FAA says.
https://www.bnd.com/news/nation-worl...239372348.html

It claims not to affect GPS below 50ft in altitude, do people think this could be an issue for cruisers in Florida/Bahamas/Carribean?
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Old 18-01-2020, 17:39   #2
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Re: Possible GPS outages in South East US This Month

The FAA website is quite precise:
https://www.faasafety.gov/files/noti...t_Advisory.pdf

The radius of 180 miles from the jamming ship at the lowest altitudes, along with the scheduled times, should give sailors, if affected, ways to work around it. There’s also the question of how degraded the signal is. If it puts things off by 100 yards, a missile misses the aircraft carrier it was aimed at, but people should still be able to see the buoy they were aiming at a 100 yards away from where they thought they were.
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Old 18-01-2020, 17:54   #3
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Re: Possible GPS outages in South East US This Month

Quote:
Originally Posted by OneHullPaul View Post
Belleville News-Democrat: Huge military exercise could jam GPS for small planes flying in the Southeast, FAA says.
https://www.bnd.com/news/nation-worl...239372348.html

It claims not to affect GPS below 50ft in altitude, do people think this could be an issue for cruisers in Florida/Bahamas/Carribean?
It would be really interesting to understand how they can jam or tweak the signal so it only has an affect on a receiver at an altitude greater than 50ft. Are they only somehow affecting altitude without affecting latitude and longitude?
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Old 18-01-2020, 18:12   #4
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Re: Possible GPS outages in South East US This Month

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Originally Posted by Paul L View Post
It would be really interesting to understand how they can jam or tweak the signal so it only has an affect on a receiver at an altitude greater than 50ft. Are they only somehow affecting altitude without affecting latitude and longitude?
Well it's a jammer at sea level so as the signal radiates out the curvature of the earth prevents the signals from being jammed at higher and higher altitudes, like a radar horizon. I imagine that the signal jammer is 50 feet above sea level and radiates upwards. So, its jamming your receiver, not the signal.
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Old 18-01-2020, 18:22   #5
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Re: Possible GPS outages in South East US This Month

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Well it's a jammer at sea level so as the signal radiates out the curvature of the earth prevents the signals from being jammed at higher and higher altitudes, like a radar horizon. I imagine that the signal jammer is 50 feet above sea level and radiates upwards. So, its jamming your receiver, not the signal.
Makes sense with a directional antenna. I was thinking it would be a much more sophisticated jamming closer to spoofing.
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Old 18-01-2020, 18:27   #6
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Re: Possible GPS outages in South East US This Month

From the 7th District LNM:

SOUTH CAROLINA – CHARLESTON: GPS TESTING
FLORIDAOFFSHORE JACKSONVILLE: GPS TESTING

The GPS Navigation signal may be unreliable due to testing on GPS frequencies used by shipboard navigation and handheld systems. Systems
that rely on GPS, such as E-911, AIS and DSC, may be affected at an approximate testing center point of 32°54'04.0"N 080°03'06.0"W, with a
possible impact radius of 50NM from center point. GPS testing is scheduled to be conducted on: 27 - 31 JAN 2020. More information is available
at the Coast Guard Navigation Center website WWW.NAVCEN.USCG.GOV. During this period GPS users are encouraged to report any GPS
service outages that they may experience to the navigation information service (NIS) by calling by calling (703) 313-5900 or by using the
NAVCEN website to submit a GPS problem report.

The GPS Navigation signal may be unreliable due to testing on GPS frequencies used by shipboard navigation and handheld systems. Systems
that rely on GPS, such as E-911, AIS and DSC, may be affected at an approximate testing center point of 30°45'14.1"N 80°23'20.8"W, with a
possible impact radius of 191NM from center point. GPS testing is scheduled to be conducted on: 16 - 24 JAN 2020. More information is available
at the Coast Guard Navigation Center website WWW.NAVCEN.USCG.GOV. During this period GPS users are encouraged to report any GPS
service outages that they may experience to the navigation information service (NIS) by calling by calling (703) 313-5900 or by using the
NAVCEN website to submit a GPS problem report.
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Old 18-01-2020, 19:05   #7
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Re: Possible GPS outages in South East US This Month

It shouldn't be a problem to cruisers, they just need to mumble "stop buzzer" over the VHF

Quote:
Pilots who encounter hazardous interruption of GPS navigation or who have flight-control issues should be aware that they can say the phrase “Stop buzzer” to air traffic control, which initiates the process of interrupting the testing to restore navigation signal reception, Duke said.

During previous GPS-interference events, pilots declared emergencies, but the jamming continued because ATC did not understand that the emergency was related to the GPS interference. According to the Pilot/Controller Glossary, “stop buzzer” is a term used by ATC to request suspension of “electronic attack activity.” Pilots should only use the phrase when communicating with ATC, or over the emergency frequency 121.5 MHz, if a safety-of-flight issue is encountered during a known GPS interference event. Using this unique phrase when experiencing an unsafe condition related to GPS interference will ensure that ATC and the military react appropriately by stopping the jamming, Duke said.

“Pilots should only say ‘stop buzzer’ when something unsafe is occurring that warrants declaring an emergency. They should make sure ATC knows that the emergency is GPS-related and that halting the GPS interference will resolve the emergency,” he said.
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Old 19-01-2020, 09:31   #8
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Re: Possible GPS outages in South East US This Month

There seems to be increased military activity lately, is this a clue?
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Old 19-01-2020, 10:42   #9
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Re: Possible GPS outages in South East US This Month

GPS jamming or more often induced error/degraded signal is done around the world by most military and defense programs. One of the reasons for GNSS and systems utilizing multiple systems- it makes degradation harder and as well spoofing harder to accomplish.
When Boomers leave Kings Bay, Ga the gps is degraded and/or jammed till they submerge.
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Old 19-01-2020, 10:54   #10
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Re: Possible GPS outages in South East US This Month

The Department of Defence very reluctantly allowed civilian use of GPS in the late 1980s. You can believe they had a way to muck with it before they even launched to satellites, and they did degrade the civilian signal for several years. Just be aware that the government giveth and the government taketh away, and you had best have a plan B for navigation, be it coastal pilotage or offshore celestial.

Ever had your computer decide to update when you're about to give a PowerPoint presentation critical to your career? Big Tech does it too.
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Old 19-01-2020, 12:03   #11
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Re: Possible GPS outages in South East US This Month

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There seems to be increased military activity lately, is this a clue?
There hasn't been an increase down here in Jacksonville, Fl. This is a navy town with 2 bases.

Same amount of activity here. Nothing has changed.
What increase in activity have you noticed?
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Old 19-01-2020, 12:53   #12
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Re: Possible GPS outages in South East US This Month

This thread is dangerously close to generating a new conspiracy theory. Let's not do that.
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Old 19-01-2020, 16:34   #13
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Re: Possible GPS outages in South East US This Month

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There seems to be increased military activity lately, is this a clue?
Remember "War Games"?
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Old 19-01-2020, 16:59   #14
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Re: Possible GPS outages in South East US This Month

That law that President Trump signed in 2018 ...restoration of LORAN infrastructure
Makes a lot of sense

National Timing Resilience and Security Act of 2018

https://www.gps.gov/policy/legislation/loran-c/
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Old 19-01-2020, 21:45   #15
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Re: Possible GPS outages in South East US This Month

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There seems to be increased military activity lately, is this a clue?
I don't think it means much by itself. For a number of years various militaries of the world have put out such notices.

I think this is however a clue that some people need to brush up on their traditional navigation!
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