B767 flight crew reported a communications breakdown between flight crew and ATC resulted in deviati...

Attributes
ACN	1673768
Time
Date	201908
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZZ.ARTCC
State Reference	FO
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Other Controlled
Flight Plan	IFR
Person 1
Function	Relief Pilot First Officer Pilot Not Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 40 Flight Crew Total 10500 Flight Crew Type 7000
Person 2
Function	Pilot Flying Captain
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	ATC Issue All Types Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Track / Heading All Types

Narrative:

I had just finished my break as international relief officer (international relief officer) and gotten into the first officer (first officer) seat to relieve him for his break as we were approaching our 030W waypoint. I had been briefed by the captain and our oceanic clearance was as filed. In the process of way point passage; we realized that our next way point in the FMC was x1n040w when the oceanic clearance had been x2n040w. We immediately entered the proper coordinate in the FMC with no idea how it was changed and began navigating to it. Within a very short period of time; we were queried by center as to what our next way point was. We stated the x2n040w coordinate and were told to proceed to x1n040w. Neither myself nor the captain had been aware of any route change before this occurred. To my knowledge; any deviation was very minor and did not conflict with other traffic.

Original NASA ASRS Text

Title: B767 flight crew reported a communications breakdown between flight crew and ATC resulted in deviation from assigned ATC clearance.

Narrative: I had just finished my break as IRO (International Relief Officer) and gotten into the FO (First Officer) seat to relieve him for his break as we were approaching our 030W waypoint. I had been briefed by the Captain and our Oceanic Clearance was as filed. In the process of way point passage; we realized that our next way point in the FMC was X1N040W when the oceanic clearance had been X2N040W. We immediately entered the proper coordinate in the FMC with no idea how it was changed and began navigating to it. Within a very short period of time; we were queried by Center as to what our next way point was. We stated the X2N040W coordinate and were told to proceed to X1N040W. Neither myself nor the Captain had been aware of any route change before this occurred. To my knowledge; any deviation was very minor and did not conflict with other traffic.

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.