GPS being jammed by military at random times. a GOOD READ for sure !

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GPS may be unreliable or unavailable in vast swaths of airspace during military activity involving GPS jamming. The FAA posts flight advisories providing schedules of the interference activity, which can affect GPS and ADS-B service. Notices to Airmen (NOTAMs) are also issued to alert pilots to the tests. Such testing is occurring between February 6 and 10 off the coast of Georgia. It could degrade GPS from the Caribbean and Florida north to Pennsylvania, and as far west as eastern Louisiana (see the FAA’s Flight Advisory). The disruption in signals could impact navigation, surveillance, autopilot, and flight control systems that use GPS.

This is from the link above......click on the link for more info.
 
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GPS 'down' or affected are also promulgated in Shipping Notices as GPS is not only for aircraft. Lists area and time / dates to - from.
 
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Had an issue such as this while 4wheel'n in the Nev. desert a couple of years ago. Our Garmin GPS would black- out in certain valleys and ravines, really sucked but we worked thru it and found our way back to the hotel. Come to find out Nellis AFB was conducting an exercise at one of their gunnery ranges and had cargo a/c doing "drops" somewhere. (wondered why those jets were so low, Duh!). H.P.:rolleyes:
 
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sar104

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Had an issue such as this while 4wheel'n in the Nev. desert a couple of years ago. Our Garmin GPS would black- out in certain valleys and ravines, really sucked but we worked thru it and found our way back to the hotel. Come to find out Nellis AFB was conducting an exercise at one of their gunnery ranges and had cargo a/c doing "drops" somewhere. (wondered why those jets were so low, Duh!). H.P.:rolleyes:
When GPS jamming tests are conducted the effect increases with altitude/elevation, and so it would not primarily be affecting you in ravines. That just suggests a lack of adequate sky view.
 

N017RW

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You can receive email notifications of the tests from FAASafety.gov.

There are tests currently in place in (off the coast of) Georgia Feb. 06-10, 2019
 
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Meta4

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Had an issue such as this while 4wheel'n in the Nev. desert a couple of years ago. Our Garmin GPS would black- out in certain valleys and ravines
The number of satellites your antenna can see is roughly proportional to the amount of sky it sees.
When you are in a canyon which blocks most of the sky, it also blocks most of the satellites.
It doesn't matter if the canyons are in the desert or between skyscrapers in the city, canyons aren't GPS friendly.
 
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