Weems & Plath Crewwatcher Single Beacon. The system works like a virtual lifeline and is made up of two components: a smartphone application and a small beacon that can be comfortably worn by each crew member. The beacon does not require complex manual activation. The alarm will set off automatically in a Man Overboard (MOB) event. Should someone go overboard the app after sounding the alarm will automatically provide lat/long coordinates of the MOB event the time of the event and will visually guide the rescuer using the virtual MOB compass. Features of Weems & Plath CREW1 Crewwatcher Single Beacon Brand: Weems & Plath Inc. Part Number: CREW1 FREE App operates on most smart phones or tablets & is easy to use No cell service required Package Contents: Weems & Plath CREW1 Crewwatcher Single Beacon Weems & Plath CREW1: Crewwatcher Single Beacon