On Mar 25th 2014 Malaysia's Transport Minister reported in the daily press conference the last complete handshake between satellite and aircraft took place at 00:11Z as previously reported, there is evidence that another incomplete hand shake occurred at 00:19Z. A new method based on Doppler effect to compute the speed of the aircraft relative to the satellite and compare these results with other aircraft along the northern and southern corridor showed little match within the northern corridor but good match with the southern corridor, the method permitted to roughly locate the aircraft at the time of the last complete handshake. As result the search in the north corridor as well as in the northern part of the southern corridor have been aborted, the search area has been narrowed to 469,407 square nautical miles instead of the previous 2.24 million square nautical miles. Works to further narrow down the search area including decoding and analysis of the last incomplete handshake at 00:19Z continue. In the search area near Perth six Chinese ships are estimated to arrive on Mar 26th, HMAS Success is going to return to the search area after temporarily having left the area due to rough sea and weather. The Transport minister said quote: "In recent days Inmarsat developed a second innovative technique which considers the velocity of the aircraft relative to the satellite. Depending on this relative movement, the frequency received and transmitted will differ from its normal value, in much the same way that the sound of a passing car changes as it approaches and passes by. This is called the Doppler effect. The Inmarsat technique analyses the difference between the frequency that the ground station expects to receive and one that is actually measured. This difference is the result of the Doppler effect and is known as the Burst Frequency Offset. The Burst Frequency Offset changes depending on the location of the aircraft on an arc of possible positions, its direction of travel, and its speed. In order to establish confidence in its theory, Inmarsat checked its predictions using information obtained from six other B777 aircraft flying on the same day in various directions. There was good agreement. While on the ground at Kuala Lumpur airport, and during the early stage of the flight, MH370 transmitted several messages. At this stage the location of the aircraft and the satellite were known, so it was possible to calculate system characteristics for the aircraft, satellite, and ground station. During the flight the ground station logged the transmitted and received pulse frequencies at each handshake. Knowing the system characteristics and position of the satellite it was possible, considering aircraft performance, to determine where on each arc the calculated burst frequency offset fit best. The analysis showed poor correlation with the Northern corridor, but good correlation with the Southern corridor, and depending on the ground speed of the aircraft it was then possible to estimate positions at 0011 UTC, at which the last complete handshake took place. I must emphasise that this is not the final position of the aircraft. There is evidence of a partial handshake between the aircraft and ground station at 0019 UTC. At this time this transmission is not understood and is subject to further ongoing work. No response was received from the aircraft at 0115 UTC, when the ground earth station sent the next log on / log off message. This indicates that the aircraft was no longer logged on to the network. Therefore, sometime between 0011 UTC and 0115 UTC the aircraft was no longer able to communicate with the ground station. This is consistent with the maximum endurance of the aircraft. This analysis by Inmarsat forms the basis for further study to attempt to determine the final position of the aircraft. Accordingly, the Malaysian investigation has set up an international working group, comprising agencies with expertise in satellite communications and aircraft performance, to take this work forward." The Minister handed out documents prepared by Inmarsat and the AAIB, see below.
In the evening of Mar 25th 2014 AMSA announced that the search is going to resume on Wednesday (Mar 26th) after gale force winds subsided and visibility improved. 12 aircraft and 5 ships (HMAS Success and 4 chinese ships) are expected in the search area on Wednesday.