Narrative:

Halfway through flight at night; our first indication of a problem was aircraft went into 'uncommanded' 30-degree bank turn. Shortly thereafter; the ECAM message for 'navigation GPS1 fault' appeared. Then 'GPS primary lost' in scratchpad. Later we got the ECAM 'navigation ads-B reporting 1/2 fault.' there was a fair amount of confusion in the cockpit as the captain nd showed right of course and correcting back to course while the first officer nd showed left of course and diverging away from course. About the same time; ATC called and ask where we were navigating to. I reported 'position doubtful' and informed ATC we were having navigation difficulties. ATC gave us a vector. At the same time; multiple aircraft on the frequency reported having similar issues. ATC noted that military was doing a large drill to our south and that may be affecting GPS capability. I contacted dispatch via phone patch. Dispatch did some investigation and found there was a large military operation in progress and NOTAM for possible GPS interference in our area. To say that my raw data navigation skills were lacking is an understatement! I've never done it on the airbus and can't remember having done it in 25 years or more. All told; we were without GPS navigation for over 45 minutes. Why the aircraft did not go to radio updating for position in a reliable manner is unknown. We eventually landed uneventfully with all GPS capability restored. Aircraft maintenance write-ups completed.

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Original NASA ASRS Text

Title: Airbus Captain reported experiencing an uncommanded heading change and navigation display disruption due to GPS signal interference.

Narrative: Halfway through flight at night; our first indication of a problem was aircraft went into 'uncommanded' 30-degree bank turn. Shortly thereafter; the ECAM message for 'NAV GPS1 FAULT' appeared. Then 'GPS PRIMARY LOST' in scratchpad. Later we got the ECAM 'NAV ADS-B REPORTING 1/2 FAULT.' There was a fair amount of confusion in the cockpit as the Captain ND showed right of course and correcting back to course while the First Officer ND showed left of course and diverging away from course. About the same time; ATC called and ask where we were navigating to. I reported 'position doubtful' and informed ATC we were having navigation difficulties. ATC gave us a vector. At the same time; multiple aircraft on the frequency reported having similar issues. ATC noted that military was doing a large drill to our south and that may be affecting GPS capability. I contacted Dispatch via phone patch. Dispatch did some investigation and found there was a large military operation in progress and NOTAM for possible GPS interference in our area. To say that my raw data navigation skills were lacking is an understatement! I've never done it on the Airbus and can't remember having done it in 25 years or more. All told; we were without GPS navigation for over 45 minutes. Why the aircraft did not go to radio updating for position in a reliable manner is unknown. We eventually landed uneventfully with all GPS capability restored. Aircraft maintenance write-ups completed.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.