The MC3E ER-2 Navigation data files contain information recorded by an on board navigation recorder (NavRec). In addition to typical navigation data (e.g. date, time, lat/lon and altitude) it contains outside meteorological parameters such as wind speed and direction and temperature. These ASCII text files are recorded every second for the length of the sortie. The Flight Summaries and Flight Track Imagery dataset which includes sonde maps, radar animation, 5-minute KICT track snapshots is distributed with this dataset.