Officials with the Australian Transport Safety Bureau said the data from the captain's flight simulator offers the best evidence for the aircraft's location.
CNN Video: Clues to mystery of MH370 may be found on captain's home flight simulator.
Data recovered from a home flight recorder that belonged to the captain of Malaysia Airlines Flight 370 shows that someone had plotted a course to the southern Indian Ocean, Australian officials told The Guardian.
So far, officials have not elaborated on who may have plotted that route.
The Australian Transport Safety Bureau told The Guardian the discovery of the plotted course does not prove previous theories that Captain Zaharie Ahmad Shah may have planned a murder-suicide.
"The simulator information shows only the possibility of planning. It does not reveal what happened on the night of the aircraft's disappearance, nor where the aircraft is located," the Joint Agency Coordination Center said in a release obtained by CNN.
MH370 disappeared in the Indian Ocean in March 2014.
The captain had been a pilot with the airline since 1981 and had flown 777s for more than 15 years, according to CNN.
Although small pieces of the plane have been recovered, most of the aircraft is still missing.