Air carrier flight crew reported possible GPS jamming resulted in loss of GPS and ads-B.

Attributes
ACN	1743436
Time
Date	202005
Local Time Of Day	0601-1200
Place
Locale Reference	UHMM.ARTCC
State Reference	FO
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Direct
Flight Plan	IFR
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Less Severe Inflight Event / Encounter Other / Unknown

Narrative:

The operating flight crew notified me of a problem while I was resting in the bunk. I went to the flight deck and they informed me that the navigation performance system indicating up to a 15 mile anp. They informed me that they ran through the appropriate checklist. I stayed on the flight deck while the anp return to a normal value. This only lasted for about 20 minutes. We continued to anchorage and landed without incident.I suggest we track the locations and times of these events in order to determine whether they are internal aircraft system related or external signal interference related.

Original NASA ASRS Text

Title: Air carrier flight crew reported possible GPS jamming resulted in loss of GPS and ADS-B.

Narrative: The operating flight crew notified me of a problem while I was resting in the bunk. I went to the Flight deck and they informed me that the NAV Performance system indicating up to a 15 mile ANP. They informed me that they ran through the appropriate checklist. I stayed on the flight deck while the ANP return to a normal value. This only lasted for about 20 minutes. We continued to Anchorage and landed without incident.I suggest we track the locations and times of these events in order to determine whether they are internal aircraft system related or external signal interference related.

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.