RS20S VHF Radio with GPSFeaturesBuilt in GPS AntennaReceive GPS data from a compatible GPS unit SMA connector for optional external GPS antenna 000-13613-001Replaces the current RS12 entry level VHFNMEA2000 connectivity for advanced functionality like backlight grouping when connected to Simrad MFDsNMEA0183 connectivityOutput DSC for DSC call, DSE for enhanced position when doing LatLong request and Buddy Track.New front mountable mechanical design for easy installationLow profile design to ali