multycpl - there are only three known facts about the flight:
1 The aircraft took off.
2 The aircraft has disappeared.
3 Various communication devices failed to communicate whether by deliberate action or other failure has yet to be determined. There is a plethora of ideas on this forum for the cause of this which you can spend a happy week or two working your way through.
We who are not directly involved in the SAR efforts are not entitled to any information and any which we are given is done so as a courtesy.
No country is going to reveal details of its surveillance measures but will often find ways of conveying relevant information to those who need it.
The AAIB and INMARSAT have done a brilliant job of attempting to determine where the aircraft may have flown but until definite proof, ie identifiable wreckage, is found even this remains a theory.