Abstract: An electronic device for locating an underwater target transmitting a signal comprises a housing; a display; at least one transducer for receiving the signal from the underwater target; a processor connected to receive signals from the at least one transducer and to control the display; and a memory storing computer readable instructions which, when executed by the processor, cause the processor to: determine a bearing to the underwater target based on the signals from the at least one transducer; determine an uncertainty in the determined bearing; and, control the display to display the determined bearing and uncertainty.

Abstract: Transmitter and receiver devices and related methods are provided for monitoring air supplies and optionally directions of a group of divers. A transmitter device includes an acoustic transmitter, and may have a housing with two nonconcentric generally cylindrical portions of different diameters. The transmitter device may send brief sonic data packets comprising pressure, identification and error checking portions encoded with an on/off modulation scheme. A receiver device decodes sonic packets received from a transmitter device, and may include a plurality of acoustic transducers for determining a direction of a transmitter device. Both the transmitter and receiver devices may be compact, low cost and have long battery life.

Abstract: Transmitter and receiver devices and related methods are provided for monitoring air supplies and optionally directions of a group of divers. A transmitter device includes an acoustic transmitter, and may have a housing with two nonconcentric generally cylindrical portions of different diameters. The transmitter device may send brief sonic data packets comprising pressure, identification and error checking portions encoded with an on/off modulation scheme. A receiver device decodes sonic packets received from a transmitter device, and may include a plurality of acoustic transducers for determining a direction of a transmitter device. Both the transmitter and receiver devices may be compact, low cost and have long battery life.

Abstract: An underwater depth measurement device includes a piezoresistive ceramic transducer in communication with a circuit for outputting an absolute pressure.

Abstract: An underwater depth measurement device includes a piezoresistive ceramic transducer in communication with a circuit for outputting an absolute pressure.

Abstract: A method of controlling a device for underwater use includes detecting a user-interaction with the electronic device based on signals received from an accelerometer, and performing an operation as a result of the user-interaction.