The chief coordinator of the Joint Agency Coordination Center retired Chief Air Marshall Angus Houston shows a map to the media during a press conference about the on going search operations for wreckage and debris of missing Malaysia Airlines Flight 370 in Perth, Australia, Monday, April 7, 2014. Houston reported the towed pinger locator deployed from the Ocean Shield has detected two signals consistent with those emitted by an in flight back box recorder, in the northern part of the current search area in the southern Indian Ocean. (AP Photo/Rob Griffith)