B777 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 242; Flight Crew Type 12060
Deviation - Track / Heading All Types; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Took Evasive Action
Environment - Non Weather Related
During entry into Class II we encountered wake turbulence from an aircraft 23NM ahead and 1000' above. We executed SLOP (Strategic Lateral Offset Procedure) left 1NM in the FMC route page to avoid any more wake [and] some possible turbulence from the weather ahead. We returned to the right side approximately 10 minutes later.
B777 First Officer reported encountering wake turbulence during cruise flight.