The UK Royal Navy has accepted the Thales 100 SEEPIRB (submarine-ejected emergency positioning indicating radio beacon) buoys into service with all classes of its submarines, including the new Astute Class.

The SEEPIRB provides distress warning and position information via radio transmissions on a satellite-aided tracking frequency for submarines.

The beacon is capable of transmitting unique messages for each unit providing identification of the transmitter to search and rescue forces.

SEEPIRBs can be launched from standard submerged signal ejectors (SSE) mk4, 6, 8 and 10 at maximum operational depth and submerged speeds of up to 15kt.

The buoys are in service with a number of submarine fleets around the world.