The world’s smallest personal locating AIS Man Overboard Beacon (MOB) with integrated DSC. The Ocean Signal MOB1 AIS Beacon communicates with the vessel you have been separated from and other marine traffic in the vicinity (up to 5 miles range dependent on conditions). The best chance of rapid rescue if you fall overboard comes from your own vessel. Your crew needs to be immediately aware of the incident and keep track of your position whilst recovery is carried out. Even in the most moderate of seas, it is alarming how quickly a visual sighting of a man overboard can be lost.