Originally Posted by hamster3null
Ocean Shield is currently at 20.8S 104.1E. Looks like supposed signals were in the same neighborhood. That's 1700 NM from last reported contact with Malaysian radar, or 280 knots for 6 hours. Even with a detour around Sumatra it still only works out to not much more than 330 knots.
I plotted a hypothetical path from VAMPI to Ocean Shield's location (20.8S 104.1E) under the assumption that the plane was flown about 200 mi north of Banda Aceh in order to avoid Indonesian radar. At this segment of the hypothetical flight the plane might also have been at a somewhat lower altitude in order to stay below the Indonesian radar horizon.
I come up with almost 2300 NM for that flight path (I don't know where you placed last radar contact with Malaysian radar); how does this fit in with your estimate?