Exercise caution in the specified FIR areas due to military activities and GNSS interference.

B1841/26

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ASPMilitary Activity

2026-09-14 21:30 - 2027-03-13 15:00

Duration:LONG6 months

Period of Applicability

2026-09-14 21:30 - 2027-03-13 15:00

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Interpretation

Operators are advised to exercise caution over the Pacific Ocean and Gulf of California within the specified portions of the Mazatlán Oceanic, Mexico, Central America, Bogotá, Guayaquil, Panama, and XX01 flight information regions due to military activities and GNSS interference. Aircraft may be at risk during all phases of flight, including overflight, arrival, and departure. Surveillance radar and conventional VOR/DME navigation aids remain fully operational nationwide.

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Raw NOTAM

B1841/26 NOTAMN
Q) MMFR/QRDCA/IV/BO/W/000/999/
A) MMFO
B) 2609142130
C) 2703131500
E) THE GOVERNMENT OF THE UNITED STATES OF AMERICA HAS ISSUED AN ADVISORY
REGARDING A POTENTIALLY HAZARDOUS SITUATION WITHIN THE MAZATLAN
OCEANIC (MMFO), MEXICO (MMFR), CENTRAL AMERICA (MHTG),
BOGOTA(SKED),GUAYAQUIL (SEFG), AND PANAMA (MPZL) FLIGHT INFORMATION
REGIONS AND IN THE PORTION OF THE NO FIR AREA (XX01) DEFINED BY
050000N 1200110W - 100143N 1043152W - 012432N 0915806W - 031924N
0915806W - 031924N 0900000W - 145857N 0900000W - 145857N 1200110W -
050000N 1200110W
IT IS RECOMMENDED THAT OPERATORS EXERCISE CAUTION WHILE OPERATING IN
THE AREAS OVER THE PACIFIC OCEAN AND THE GULF OF CALIFORNIA WITHIN
THESE FLIGHT INFORMATION REGIONS (FIR) DUE TO MILITARY ACTIVITIES AND
GNSS INTERFERENCE. THERE IS A POTENTIAL RISK TO AIRCRAFT AT ALL
ALTITUDES, INCLUDING OVERFLIGHTS AND THE ARRIVAL AND DEPARTURE PHASES
OF FLIGHT.
AIR NAVIGATION AND AIR TRAFFIC CONTROL SERVICES MAINTAIN THEIR
SURVEILLANCE SYSTEMS (SURVEILLANCE RADAR) AND CONVENTIONAL RADIO
NAVIGATION AIDS (VOR/DME) NATIONWIDE FULLY OPERATIONAL, AS THESE ARE
NOT VULNERABLE TO GNSS INTERFERENCE
F) SFC
G) UNL

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