Communications – electrical: acoustic wave systems and devices – Distance or direction finding – With electromagnetic wave
Reexamination Certificate
2007-09-18
2007-09-18
Pihulic, Dan (Department: 3662)
Communications, electrical: acoustic wave systems and devices
Distance or direction finding
With electromagnetic wave
Reexamination Certificate
active
11182894
ABSTRACT:
A navigation system extends satellite navigation to divers. The navigation system comprises a surface unit and a plurality of sub-surface beacon units. The surface unit includes a receiver to receive navigation signals from earth-orbiting satellites, processing circuits to communicate with to sub-surface beacon units and to transmit location information to said sub-surface beacon units, and a sonar transmitter to transmit location information to the sub-surface beacon units. The beacon units include a processing circuits to determine the location of the beacon unit based on location information received from the surface unit, and a sonar transceiver to receive location information from the surface unit while the surface unit is floating on the surface; and to transmit location information to a diver unit to provide navigation assistance to the diver unit.
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Coats & Bennett P.L.L.C.
Pihulic Dan
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