Even in moderate seas, it is alarming how quickly a visual sighting of a man overboard can be lost, meaning that seconds count in a man overboard situation.This Personal Man Overboard Beacon with integral GPS has dual alert capabilities via Automatic Identification System AIS and Digital Selective Calling DSC.It automatically activates upon inflation of your lifejacket and, unlike a personal locator beacon, which signals orbiting search and rescue satellites, the AISLink sends an alert message within seconds to all local vessels up to 5 miles away with an AIS receiver and/or AIS ~enabled plotter.The unit also has the ability to alert your crew to the emergency by activating the DSC alarm on your vessel’s VHF.The integrated GPS quickly pinpoints a precise location and transmits this, along with MOB emergency messages as part of the AIS alert enabling the crew to find and retrieve the casualty. Features:Ultra bright LED strobe lightHigh ~impact housing ~ withstands a drop to water of 20mSimple life jacket integrationManual or Automatic activation24+ hours operational life, 7 year battery lifeThree test modes; Functional, DSC and AIS/GPS10m waterproofOperational Temperature Range: ~20 degrees C to +55 degrees CSize: 115x46x27mm, Weight: 92g5 year warranty.