One thing that had always irritated with this datum is that all known primary radar facilities in the area have a range of 60 or even 50 NM only, which is normal for their purpose. The 200 NM offshore position must have been detected by something that was not land based or can a primary radar range be stretched beyond its nominal range when analysing raw data?
You are talking about the known ranges of the ATC radars. The track was created from a military radar, the ranges and capabilities are not public. And if we take a close look on the shown radar plot we will see no other traffic on it, which means it is an edited picture showing the assumed track of MH370 over a period of time, not one sweep, but multiple antenna sweeps put together.
A military PSR radar with a radar coverage of 60 NM would be useless, as incoming hostiles tend to fly with the transponder in off position. 60NM are covered in less than 7 Minutes at 540 groundspeed and would not allow for appropriate action.
Edit: Found this article:
http://www.themalaysianinsider.com/s...-kua-kia-soong