It is indeed frustrating that they haven't published the arcs generated by any pings except for the final one.
I notice that now they consider the primary contact that was picked up by Malaysian military radar to have definitely have been MH370. It is now being labelled on maps in the media as 'last radar contact'.
What led them to believe that this contact was definitely MH370 and not just probably MH370? Are we to assume that the arcs from the intermediate pings confirm this?
Curious as is it not possible that the aircraft went straight from its last known secondary radar position direct to a point on one of the two arcs generated by the final ping?