Can't work out how to paste the image here.
I have calculated the solar terminator for 0018 UTC on March 8 2014, and the link below seems to work.
http://www.timeanddate.com/scripts/s...=20140308T0018
So if plan was to ditch around first light, this would suggest a long way SW along the final (7th) arc. Somewhere close to the initial air search area a long way WSW of Perth.
The further NE along the 7th arc the flight ended, the longer the plane was flying in daylight.