B777 captain reported suspected GPS jamming on the route of flight.

Attributes
ACN	1619407
Time
Date	201902
Local Time Of Day	0001-0600
Place
Locale Reference	LTAA.ARTCC
State Reference	FO
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B777-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy

Narrative:

We got a left and then right ads-B out alert at FL370 approaching iraq airspace while in southeast turkey. The GPS signal appeared to be jammed from just east of waypoint oktep near N3754; E4235. We regained the GPS signal approximately 15 minutes later just east of waypoint otido; near N3700; E4426. No degradation of the aircraft's other navigation was noted. The aircraft stayed on course throughout the event. Jamming of GPS signal by unknown source. Don't fly in the vicinity of active combat zones.

Original NASA ASRS Text

Title: B777 Captain reported suspected GPS jamming on the route of flight.

Narrative: We got a left and then right ADS-B OUT alert at FL370 approaching Iraq airspace while in Southeast Turkey. The GPS signal appeared to be jammed from just east of waypoint OKTEP near N3754; E4235. We regained the GPS signal approximately 15 minutes later just east of waypoint OTIDO; near N3700; E4426. No degradation of the aircraft's other navigation was noted. The aircraft stayed on course throughout the event. Jamming of GPS signal by unknown source. Don't fly in the vicinity of active combat zones.

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.