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Inmarsat has told the BBC it gave the Air Accidents Investigation Branch (AAIB) the new data on Sunday - adding it needed to be checked before it was made public.
The firm said its latest calculation involved a large amount of data analysis, focusing on a number of factors including the movements of other aircraft.
It involved an entirely new way of modelling which is why the analysis took some time, the firm added.
A spokeswoman for the AAIB said: "As set out by the Malaysian prime minister, we have been working with the UK company Inmarsat, using satellite data to determine the area on which to focus the search.
"We are not able to comment further on this investigation, which is being led by the Malaysian authorities."
Oceanographer Dr Simon Boxall, from the University of Southampton, told the BBC it was significant that Inmarsat had been tracking data, rather than locations.
"The algorithms and the techniques they've applied to try and locate to within a certain area where the last transmission was made is really quite phenomenal - but also quite tragic because it does show this plane was heading to an open area of ocean."
Dr Boxall continued: "They [Inmarsat] started from scratch. They've probably crammed almost a year's worth of research into maybe a couple of weeks so it's not a routine calculation they would ever, ever make.
"So they've been looking at all the signals they have, all the recordings they have, and processing that many times over to try and pinpoint where the plane's signal came from. Technologically it's really quite astounding."
He added that Inmarsat must have run through its calculation a number of times and "wouldn't have released this sort of information without being 100% certain".
来源：UK firm behind Malaysia Airlines flight MH370 breakthrough