Safety guaranteed; clear sound quality; double/triple watch; can watch the channel 16 while listening to the current channel; the horn will shake the drainage and make the communication clearer. Long range; can meet the daily use needs; even far-sea operations can ensure communication safety. Sturdy and durable; specially designed for harsh environment; strong salt resistance and corrosion resistance; can be used at sea for long periods of time. Super waterproof performance; IP67 waterproof; quickly floating on the water surface and flashing alarm after falling into the water; it can prevent immersion in water for 30 minutes within one meter depth of water. NOAA weather alarm can provide real-time weather conditions; which can help you to prepare for the bad weather in advance. Tri-watch can provide necessary and important information when you have commercial vessels. The MOB function record your geographic location; if only you open GPS function;the geographic coordinates will be sent to other ships. DSC system can send SOS signal to others; and then you can wait for help; you need to set the DSC signal in advance; when you are in danger; you can send DSC signal; turn on the GPS; DSC can real-time update the location. RM40 Marine radio handheld with GPS function can automatically identify your position;high-precision navigation and positioning; its maximum error does not exceed 100 meters. Note: DSC radio with GPS needs to enter MMSI code to use GPS location recognition function.