Signals from the black box of the missing EgyptAir flight were picked up by a French ship on 2 June from the waters between Crete and the Egyptian coat from 2 km (1.24 miles) to 5 km.
This would solve the mystery of why the plane crashed into sea killing all 66 passengers on board.
The flight recorders, if retrieved, will be of signifiance in understanding whether the incident was an accident or caused deliberately.
Locating the black boxes is crucial to understanding why the Airbus A320 plummeted into the Mediterranean en route from Paris to Cairo on May 19, killing all passengers on board.
In the two weeks since the EgyptAir flight went missing, small pieces of debris and human remains were retrieved from the site.
The French naval vessel, Laplace, is equipped with three detectors to pick up signals, which in case of the EgyptAir plane is believed to be at a depth of 9,842 feet. Another ship is to joint the seacrh soon.
Egypt Civil Aviation Minister, Sherif Fathi, has said terrorism was more likely to cause an equipment failure, but no terrorist group has claimed responsibility for the act.
French Transport Minister Alain Vidalies said it would take eight days before the black box is recovered from the seabed.