This paper presents operation and evaluation status of Centimeter Level Augmentation Service (CLAS) utilizing L6 signal in Quasi-Zenith Satellites System. In the service, Centimeter Level Augmentation Information including correction and integrity information is allocated to QZSS L6 signal and broadcast to users available for the major part of Japan and within the territorial waters. CLAS begun on November 1, 2018 with a four-satellite constellation of QZSS.
