Astrometric observations of Cassini's Imaging Science Subsystem (ISS) Narrow Angle Camera (NAC) of Mimas and Enceladus. Camera's field of view is about 0.35 degrees, Image size 1024x1024. Image resolution is 1.2354-arcsec/pixel. 870 and 920 observations of Mimas and Enceladus, respectively, are provided. Positions in right ascension and declination, camera's pointing vector orientation, and image positions (in pixels) are given in the table. The method for astrometric reduction and satellite center of figure measurement are well described in paper. Satellites astrometric positions are given in ICRF reference frame and centered on Cassini spacecraft. (1 data file).