Patent ID: 7388512

Claim:
A system for locating divers, comprising: a submersible diver module, said diver module including: a radio frequency transmitter; an audio frequency transmitter; and a switch, wherein an operating mode of said diver module can be selected, said operating mode including an active mode, wherein in said active mode said radio frequency transmitter produces a radio frequency location signal and said audio frequency transmitter produces an audio frequency location signal, and wherein said radio frequency location signal and said audio frequency location signal are produced in at least one of an alternating fashion, simultaneously or substantially simultaneously; a boat module, said boat module including: a directional hydrophone, wherein said directional hydrophone is operable to receive location signals from said audio frequency transmitter of said diver module at least when said diver module is submerged; and a location signal receiver, said location signal receiver including: a directional radio frequency receiver, wherein said directional radio frequency receiver is operable to receive location signals from said radio frequency transmitter of said diver module at least when said diver module is not submerged; an input from said directional hydrophone; and a directional output, wherein said directional output points towards said diver module when said diver module is in an active mode and at least one of said radio frequency location signal and said audio frequency location signal is received at said boat module.