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The next generation 406MHz & AIS PLB with Water Activation and Return Link Service (RLS)

The sMRT Shield utilises two of the world’s most advanced locating technologies, AIS and 406MHz, combining the advantages of both into one device. Local area alerting AIS will automatically activate on immersion in water, which is critical if a person goes overboard unconscious or in a debilitated state, and the 406MHz can be manually activated singlehandedly for worldwide detectability for those who might sail alone or a little further from shore.

  • Global coverage with near real time detection and location
  • Multi-mode locating systems provide SAR assets with highly accurate position information
  • Multiple activation methods including water activation
  • Suitable for integration with a wide range of lifejackets
  • RLS Function provides the user with the comfort of knowing their distress message has been received
  • Multi-constellation positioning support means higher accuracy and faster time to first position fix
  • A small rugged construction ensures the PLB is suitable for use in the toughest outdoor environments
  • The best emergency beacon for hiking, mountaineering, sailing, biking, walking etc

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Water Activated

Water Activated

What is the sMRT Shield?

The sMRT Shield has been developed to take advantage of the next-generation improvements to the MEOSAR system including the introduction of the new Return Link Service (RLS). The sMRT Shield features a dedicated indicator to inform the user their distress message has been received and give the user peace of mind that help is on the way.

The sMRT Shield is a 406 Personal Locator Beacon (PLB) developed in conjunction with the European GNSS Agency (GSA) for the recreational industry to help save lives at sea in case of a Man Overboard (MOB) situation.

What is MEOSAR?

MEOSAR is the next generation in global distress alerting and location and is available now via the European Galileo satellite system. Search and rescue transponders onboard the positioning satellites relay distress messages to ground stations, providing near real-time alerting and locating.

If you would like to know more about the sMRT Shield or to register your interest, please contact a member of our team at:

What is RLS?

On receipt of a distress message SAR authorities can send the PLB a unique message via the MEOSAR satellites that confirms that the distress has been received. MRT’s PLB features a dedicated indicator that informs the user that their distress message has been received and that help is on the way.

For more information on MEOSAR and the COSPAS-SARSAT system please follow this link:

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Global Headquarters
Marshall House,
Zarya Court, Grovehill Road, Beverley,
East Yorkshire, HU17 0JG, United Kingdom