JRC JSS-2150,2250,2500 SSB, MF/HF RADIO EQUIPMENT 3.8” Display The MF/HF has a 6-channel DSC as standard with a built-in DSC watch-keeping receiver. Generate and receive digital selective calls for quick and  efficient establishment of distress, urgency, safety and routine communication with other ships and coast stations. In urgent situations, the JSS-2150 sends a distress alert once you press the distress button. The integrated DSC watch-keeping receiver monitors distress alarms through continuous scanning of distress frequencies