Now coming back to GIG's informative post that says the ship was dragging the ping locator at a depth of 1.9 miles (3040 m) one can obviously understand 2 reasons for them doing so
a)To get rid of whatever distortion and diversion "the sound fixing and ranging layer" would have caused to the signal and b) to lower the pinger as closer to the source of the pings as possible.
So from that the obvious conclusion is that the pings that they detected were within 1.12 miles DIRECTLY away from the location of the pinger.
Was that so? We will see later.
For the moment just review some facts.
A)the 4 verified pings are these
http://edition.cnn.com/2014/04/09/world ... hpt=ias_c1
The first signal, at 4:45 p.m. Perth Time on Saturday, lasted 2 hours 20 minutes.
The second, at 9:27 p.m. Saturday, lasted 13 minutes.
The third signal was picked up Tuesday at 4:27 p.m. That lasted 5 minutes 32 seconds.
The fourth, at 10:17 p.m. Tuesday, was 7 minutes long.
A)all 4 verified pings were detected by Ocean Shield and the sonar it dragged at 3040m below sea level.
http://www.malaysiakini.com/news/259515
All four pings were picked up by the Australian Defence Vessel (ADV) Ocean Shield at the northern end of the defined underwater search area of about 75,423 square kilometres.