US Patent 7388512 Diver locating method and apparatus

A system for locating a diver is provided. The system includes a diver module for association with a diver that is capable of producing both an audible frequency signal to assist in locating the diver while submerged, and a radio frequency signal to assist in locating the diver when surfaced. In addition, the diver module includes a switch to enable the initiation of an active mode of the diver module. The diver module may also include a receiver visual display to indicate the direction to another diver module or to a boat module. The location signal boat module provides a boat operator with an indication of the direction from which a location signal is being received.