Professional Man Over Board device incorporating both AIS and 121.5MHz homing beacon

  • AIS transmissions for position plotting AIS transmissions for position plotting
  • 121.5MHz transmission for homing 121.5MHz transmission for homing
  • Designed for automatic activation in Life Jacket* Designed for automatic activation in Life Jacket*
  • Simple to fit to Life Jacket* Simple to fit to Life Jacket*
  • >12hours transmission >12hours transmission
  • 66 channel GPS for fast accurate positioning 66 channel GPS for fast accurate positioning
  • 2 year warranty 2 year warranty
  • Five year battery life Five year battery life
  • M100X ATEX and IECEx Zone 2
M100X ATEX and IECEx Zone 2

M100 DimensionsThe M100 and M100X MSLD (Maritime Survivor Locating Device) from Ocean Signal has been designed to meet the needs of the professional marine market and its offshore workers. The M100 and M100X can be fitted to a life jacket* and will automatically activate on inflation of the jacket. Once activated the M100 and M100X will transmit an alert to all AIS receivers and AIS enabled plotters in the vicinity. The M100 and M100X also transmit a 121.5 MHz homing signal in addition to the AIS. The integrated 66 channel GPS ensures a position update is provided every minute via AIS. The M100X is designed to meet the European ATEX directive and IECEx approval for use in zone 2 explosive atmospheres.

The following statement is for US customers only:  This device has not been authorized as required by the rules of the Federal Communications Commission. This device is not, and may not be, offered for sale or lease, or sold or leased, until authorization is obtained.

* Always refer to the manufacturer for specific instructions before installing this product directly to your life jacket.


Frequently Asked Questions

Why does the displayed MMSI not change when I enter my DSC MMSI number?

All AIS and DSC MOBs are pre programmed at the time of manufacture with the self identification MMSI number.  In the case of the rescueME MOB1, or the M100, this number will always start 97260—-.  The 972 identities the device as an MOB device and the 60 identifies the device as manufactured by Ocean Signal.

It is not possible for the user to change this number, which is a requirement of the relevant approval standards.

The DSC MMSI number programmed in by the user is the number the MOB1 will send the distress calls to.  Compatible radios will still show the ‘from’ MMSI number as the 972 number printed on the rear of the MOB1.  Likewise the target displayed on an AIS plotter will also show with the target address as the 972 number.



AIS Transmission

Transmit Power(EIRP)
Baud Rate

Homer Transmission

Transmit Power(EIRP)


Temperature Range (Operational)
-20°C - +55°C
Temperature Range (Storage)
-30°C - +70°C
Damp Heat (humidity)
40°C @ 93%
10m depth
132mm x 53mm x 28mm
RTCM SC11901, EN303 098, EN302 961


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