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Personal Man Overboard Beacon

Overboard situations can be a little less hair-raising with the Automatic Identification System (AIS) Man Overboard Beacon (MOB). The AISLink features integrated Digital Selective Calling (DSC) and GPS technology, so you can quickly reach out for help when you need it most. Unlike a personal locator beacon, which signals orbiting search and rescue satellites, AISLink sends an alert message within seconds to all local vessels with an AIS receiver and/or AIS-enabled plotter. Plus, the DSC alarm on your vessel’s VHF radio can also be signaled to make first responders aware of what's going on.

Seconds count in a man overboard situation. The AISLink MOB automatically activates upon inflation of the lifejacket, sending an initial alert within 15 seconds to all AIS receivers and plotters in the vicinity. Both positioning and MOB emergency messages are transmitted alerting vessels up to 5 miles away of your emergency situation.

Even in moderate seas, it is alarming how quickly a visual sighting of a man overboard can be lost.  The AISLink MOB’s integrated GPS quickly pinpoints a precise location and transmits this as part of the AIS alert message to all local AIS equipped vessels. The AISLink MOB also has the ability to alert your crew to the emergency by activating the DSC alarm on your vessel’s VHF. All AIS receivers and AIS-enabled plotters within a 5-mile radius (dependent on conditions) are alerted, and an integrated high-intensity strobe light assists with accurate positioning even in low light conditions. Powerful lithium metal batteries provide 24+ hours of operational life, and the high-impact housing can withstand a drop to water of 20m.


The video below details how to install the AISLink MOB. The video highlights use of the Oral Mounting Bracket to attach the MOB to the Oral Inflation Tube on an auto inflatable lifejacket with a separate bladder (additional installation instructions and installation scenarios are available in the AISLink MOB product manual)


Note that most modern AIS plotters and DSC VHF units comply with the standards for receiving MOB transmissions. However, it is recommended that you check with your equipment manufacturer to ensure compatibility. DSC functionality may vary — or be disabled entirely — according to the regulations of individual countries.

Features and Benefits:

  • Dual alert via AIS and DSC
  • Onboard GPS for exceptional location accuracy
  • Simple life jacket integration
  • Manual or Automatic Activation
  • Alerts AIS equipped vessels up to 5 miles (4.3 NM) away
  • 24+ hours operational life and 7 Year battery life
  • Ultra bright LED strobe light 
  • Rugged and Waterproof up to 10 meters
Activation Method
Manual or Automatic Activation
Coastal Cruising, Sailing, Offshore Recreational, Commercial Marine
Battery Life
7 Years from date of manufacture or after emergency use (24+ hours operational battery life)
10 Meters
0.2 lbs (92 g)
5 years
GPS Enabled
4.52 x 1.81 x 1.06 in. (115 x 46 x 27 mm)
LED Strobe
Temperature Range (Operational & Storage)
Operational: -4°F to +131°F (-20°C to +55°C)
Storage: -22°F to +158°F (-30°C to +70°C)
AIS channel 1- 161.975 MHz, AIS channel 2 - 162.025 MHz, DSC 156.525 MHz
Transmit Power (EIRP)
AIS: 1 Watt, DSC: 0.5 Watt
Baud Rate
AIS: 9600 Baud, DSC: 1200 Baud
AIS Messages
Message 1 (Position), Message 14 (MOB Status)
AIS Repetition Interval
8 messages/minute (message 14 sent twice every 4 minutes)
DSC Messages
Individual Distress Relay (single call made on press of the activation button, in regions where it is allowed)
DSC Repetition Interval
Once every 5 minutes (Relay only)
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acr aislink mob

ACR logo

pdf ACR AISLink MOB User Manual
pdf ACR AISLink Spec Sheet
pdf ACR AISLink MOB Material Safety Data Sheet
pdf ACR LB9M Lithium Battery Product Safety Data Sheet

www Configure AISLink MOB
www How Does a Rescue Work?


acr aislink mob


aislink moib

ACR AISLink MOB - Personal Man Overboard Beacon


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