(CNN) -- In a sea of uncertainty, two bits of good news emerged Wednesday.
The Australian ship Ocean Shield picked up fresh signals that officials hope are locator beacons from the data recorders of the missing Malaysia Airlines Flight 370.
The ship had first picked up the underwater pulses Saturday. But then, for the next three days, nothing.
"I believe we are searching in the right area but we need to visually identify wreckage before we can confirm with certainty that this is the final resting place of MH370," Houston said.
The second piece of good news? Authorities analyzed the signals picked up Saturday and determined they were not of natural origin and was likely sourced from specific electronic equipment.
"They believe the signals to be consistent with the specification and description of a flight data recorder," Houston said.