Full data from the Sewol's automatic identification system, an on-board transponder used for tracking, showed the ship in fact made a J-shaped turn before listing heavily and sinking last week, leaving more than 300 people dead or missing.
A ministry of ocean and fisheries official said on Friday that the vessel had taken a sharp turn, but another official has said the AIS data had been incomplete and the true path of the ship became clear when the information was fully restored.
The cause of the disaster is not yet known. The third mate, who has been arrested, was steering at the time of the accident, in a challenging area where she had not steered before, and the captain said he was not on the bridge at the time.
Authorities have not named her, though a colleague identified her as Park Han-gyeol.
Meanwhile, more than 100 bodies have been retrieved from the wreckage of the ferry.
Dozens of police formed a cordon around the dock on Jindo Island as the latest bodies arrived. The death toll has shot up since the weekend when divers found a way to enter the submerged ferry. Officials said today the fatalities had reached 104.
The ferry sank with 476 people on board, many of them pupils from a single high school.
Families who once dreamed of miraculous rescues now simply hope their loved ones' remains are recovered soon, before the ocean does much more damage.