Screen Grab from the video above (https://www.youtube.com/watch?v=1ma6lBtvr5w)
Screen-Grab-From-Video-RAAF-Rescue104-at-50-seconds
The "observers" in the Orion call "MARK MARK MARK" when they see something.
Note the FOUR "MARKS". M1 M2 M3 M4.
That is a "pretty tight" debris field, all things considered.
The distance between those two crossed datum points (joined by my added red line) is only 4.63 nautical miles, on the 24th March 2014, which is 16 days after MH-370 went missing.
Edited - 14 July 2016 to add: