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Thu, Jan 20, 2011

GPS In The Southeast May Be Inaccurate Or Unavailable During Testing

Evaluation Of System Centered Off The Georgia Coast

The Department of Defense will conduct GPS tests on January 20th through February 22nd, 2011. During testing, the GPS signal may be unreliable or unavailable.

The testing will be centered at 304906N/0802811W or the location know as 105.25 degrees and 52.1 NM from the SSI VOR. GPS testing is scheduled on January 20th through February 11th, 2011 from 0000-0245 UTC daily and February 15th through February 22nd, 2011 from 0000-0245 UTC daily. These tests may not be concurrent so pilots are advised to check NOTAMS frequently for possible changes prior to operating in the area.

Several test events will be conducted and will be active for 45 minutes followed by 15 minutes of off time. During testing, GPS will be unreliable and may be unavailable with in a circle with a radius of 370NM and centered at 304906N/0802811W or the location known as 105.25 degrees and 52.1 NM from the SSI VOR at FL400; decreasing in area with a decrease in altitude to a circle with a radius of 325NM at FL250; a circle with a radius of 260NM at 10,000FT MSL and a circle with a radius of 215NM at 4,000FT AGL.

Pilots are highly recommended to report anomalies during testing to the appropriate ARTCC to assist in the determination of the extent of GPS  degradation during tests. The NOTAMs discussed in this advisory may change with little or no notice. Pilots are advised to check NOTAMs frequently for possible changes prior to operations in the area. NOTAMs will be published at least 24 hours in advance of any GPS tests.

FMI: www.faa.gov

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