Garmin Cortex-M1 AIS Class B SOTDMA smartAISThe Garmin Cortex M1 AIS Class B SOTDMA SmartAIS Transponder is a high speed safety hub for serious sailors. It combines AIS, GPS, and heading data with smart safety logic and seamless NMEA networking to your chartplotters and MFDs. AIS: SOTDMA Class B AIS with two dedicated receive channels and 5 W transmit power for reliable vessel visibility on AIS networks. Dedicated AIS receive channels: Two dedicated AIS receive channels to ensure robust vessel