The Ca Mau think was 1st reported a day ago.
If the A/C ELT was going off the 406 signal would have been picked up by satellite long ago. And I would like to think every pilot within a thousand miles was listening to 121.5 on a comm "just in case"
Do we know for sure this aircraft had an ELT installed? Maybe it had one of the "Firestarter406's" in it an was pulled after the 787 barbecued?