VHF 215 AIS Displays Automatic Identification System (AIS) on the chartplotter. Standard Class D Digital Selective Calling (DSC) functionality (distress calling and direct calling with user-programmed MMSI). In case of trouble, DSC may improve your chances of a rapid rescue. 25-watt transmit power with built-in GPS. Frequency bands include all U.S., Canadian and international marine channels plus 10 NOAA weather channels.