I have written on this topic before. Here is a summary of what was known in December 2014:
and a later comment on the Indian angle:
As mentioned earlier, one forum which attracts a fair number of well-informed comments is:
Sometimes a single article attracts over 1200 comments, which are worth reading if you want to know about this deepest of mysteries.
Basically the old idea that the crash’s location was determined by the BFO transmissions is being given less credence now-so if the plane did not go to the southern Indian Ocean, where else could it have gone? This aspect is studied by Victor Iannello here:
Anyone a bit familiar with Indian aviation would see something wrong in his scenario. Look at the map and then see my comment (among the first few).