Operational distribution of MEOSAR alert data began at 1300 UTC on 13 December 2016. This operational phase of MEOSAR is known as the early operational capability (EOC), and is being carried out in parallel with continued testing and adjustment through the contemporaneous demonstration and evaluation (D&E) phase. Ultimately, the MEOSAR system will be able to provide near-instantaneous detection, identification, and location-determination of 406-MHz beacons. Prior to the operational introduction of MEOSAR, MEOSAR data was successfully used to assist in determining the crash location of EgyptAir flight 804 in the Mediterranean Sea. The location of a distress beacon is calculated by the receiving LUT by analyzing the frequency-difference-of-arrival (related to Doppler-induced variations), and/or the time-difference-of-arrival of a beacon's radio signal due to the differences in distance between the beacon and each MEOSAR satellite that may be in view.