Underwater acoustic beacon.

摘要

Acoustic marker for use at sea arranged in a pipe-shaped housing (11). In the one end there is space for a battery (12) which drives a transmitter (31) disposed coaxially around the housing at the other end, where there is arranged a pressure switch (24) covered by a membrane (27). The transmitter is switched on by the pressure switch when the pressure on the outside of the membrane exceeds a certain limit on the marker falling in water.