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AIS MOB – DSC distress call and 121.5 MHz homing signal to fasten up rescue missions at sea


AIS & DSC in one device! Can be programmed quickly and easily via Bluetooth.



The easyRESCUE-PRO rescue transmitter triggers an alarm in the AIS system as well as in the DSC GMDSS emergency call system. For your personal security, you can take advantage of both technologies in one device.

Because in an emergency every second counts!


The easyRESCUE-PRO sends out, as soon as it has GPS position information, a worldwide standardized emergency telegram, which can be received by any AIS receiver within the range of the transmitter.

This emergency telegram includes the current GPS position, the individual device identification number as well as data on course and speed. Thus it is clear to everyone where the victim is at the moment, and in which direction he is driven in the current at what speed.

The AIS emergency telegram is re-transmitted every minute with an updated position.

The received data are converted by the AIS receiver, so they can be displayed on a chart plotter or computer screen.



Immediately after the activation, the easyRESCUE-PRO sends out a DSC emergency call. This does not yet contain any positional information, but  the individual device identification number of the transmitter. As a first step, this is very helpful. As soon as a GPS fix has been issued, the DSC distress call, the so-called “DSC distress call”, is sent again.

closed loop

First, the easyRESCUE-PRO works in the “closed loop”. This means that the emergency call is only sent to MMSI numbers, which were programmed into the device in advance. Up to 8 different MMSI numbers can be programmed into the internal memory of the easyRESCUE-PRO in the “closed loop”. Especially if you are part of a fleet, this can be very helpful.

On board, these up to 8 ships, can now be confirmed the emergency call within the next 10 minutes. When such an acknowledgment is made, the easyRESCUE-PRO receives this acknowledgment and an audible signal is emitted. The rescue transmitter then switches off the DSC function by itself to keep this radio channel clear. However, AIS transmissions are still sent to all recipients within the broadcasting range.

open loop

If no confirmation from one of the (up to) 8 ship MMSI is made within the 10-minute window, the easyRESCUE-PRO automatically changes to the “open loop” mode. This means that a general “all ships call” is now sent via DSC. From that moment, other ships, outside the group of the 8 pre-programmed ships, can also receive the emergency call. Professional vessels have the possibility to forward the emergency call with their radio equipment. Thus, the DSC “distress call” of an injured person can be extended over many hundred nautical miles to a rescue center on the coast. The confirmation goes back the same way and there is also an audio signal on the device. The easyRESCUE-PRO then switches off the DSC function to keep the radio channel clear.


In accordance with all currently valid regulations, a DSC rescue transmitter may only be operated in Germany if it has a built-in DSC Class B receiver at the same time. This is necessary so that the DSC function can be switched off after the reception of the acknowledgment. Otherwise, In the “open loop” there would be a massive disturbance of the radio traffic within the GMDSS rescue chain. As a result, the rescue transmitter without a receiver continues to transmit, blocking in that way the channel.

Bluetooth - only in easyRESCUE-PRO (BT)


The easyRESCUE-PRO (BT) rescue transmitter has an integrated Bluetooth-LE module. This allows an easy and fast programming of the up to 8 different MMSI numbers in the rescue transmitter.

These settings can be made with its own Weatherdock app, which is available for both Apple IOS and Android free of charge.

Highlights & Features


  • Automatic triggering of the AIS transmitter with full water contact
  • Automatic triggering of the AIS transmitter via a pull-cord and magnetic switch
  • Simultaneous automatic triggering of a DSC “distress call”
  • Up to 8 MMSI numbers for “closed loop” to your own ship or group of ships
  • After 10 min. Change to “open loop” to all DSC receivers
  • Splash protection against unintentional release
  • Mother ship with AIS reception sees current position of the victim
  • Mother ship with DSC receives “closed loop” DSC distress call
  • Each minute a new current GPS position
  • AIS telegrams 8x per minute
  • In the “open loop” each ship can use DSC receiver to initiate rescue or forward emergency call
  • Approvals:
    # CE and R&TTE approvals
    # Federal Maritime and Hydrographic Agency BSH (easyRESCUE)
    # SOLAS (Professional shipping authorization, based on SOLAS certified standard equipment easyRESCUE)
    # DSC according to RTCM and Class D
  • Range up to 15 nm (depending on the height of the receiving antenna)
  • No running costs
  • No satellite waiting times
  • Made in Germany by market leader

Technical specifications


  • Transmission power: >2W
  • Waterproof, IP68
  • Operating conditions: -20°C – 55°C
  • (L) 125mm, (W) 68mm, (H) 30mm,
  • Weight: ca. 350g
  • >96 hours operating time (with immediate DSC confirmation)
  • Battery life: 5 years (SOLAS standard)
  • Service Interval:* after usage
    * After 5 years, only TEST modeDSC
  • Transmission power: >1W


  • DSC frequency 156,525 Mhz
  • ≥24 hours of permanent transmission after activation of both emergency call systems
  • „Closed & open loop“ according to RTCM standard 11901.1


Our easyRESCUE Rescue Transmitters have a basic approval and do not have to be registered anymore!

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