The MX521B is an IMO compliant D/GNSS smart antenna for the professional market. It provides enhanced position performance with GLONASS and GPS, and delivers position accuracy better than 1 m in DGPS/DGNSS mode when using RTCM corrections. It also has the ability to select SBAS (WAAS, EGNOS, MTSAT) corrections from the CDU. Beacon Navigation authorities around the world have installed DGPS radio beacon networks that broadcast RTCM Corrections. With the use of its built in beacon demodulator, the MX521B uses these Real-Time DGPS corrections from compliant IALA beacon base stations to deliver accurate, reliable positioning when antenna is within range of beacon station. RAIM receiver autonomous Integrity Monitoring (RAIM) is a safety feature in the MX521B which continuously verifies the integrity of the GPS system to ascertain its accuracy and reliability. When satellite range error exceeds a pre-set limit, the CDU alerts the operator to take precautionary measures. Interface The MX521B features two independent NMEA compliant serial ports which are identical to MX421B-10 and MX521A DGPS smart antennas. The MX521B will connect directly with the new P3007 CDU.