A dive computer with a free dive mode and/or wireless data transmission capabilities. In one embodiment the invention relates to a diving apparatus including a dive computer having a free dive mode, where the dive computer is configured to calculate a nitrogen loading in the free dive mode using a default value which is the fraction of oxygen in air, and where the free dive mode is used when a diver makes a dive without a self-contained underwater breathing apparatus. Another embodiment includes a method of operating a dive computer including recording two or more first identifiers, receiving pressure information from two or more pressure transmitters, the pressure information comprising second identifiers and pressure measurements, determining whether the pressure information contains one of the two or more first identifiers, and displaying a message indicative of the pressure information that contains one of the two or more first identifiers.

Equipment for underwater use with battery compartment cover provided with bayonet type connection system for fastening and unfastening the cover to/from the body of the equipment.

Dive computers incorporating a variety of features are disclosed. One embodiment of the invention includes a dive computer including a microprocessor, memory configured to store a software application, a pressure transducer configured to determine depth information, and a communications device configured to communicate with external devices, wherein the software application configures the microprocessor to create a dive log stored in memory, wherein the dive log includes recorded information including depth of submersion information recorded from the pressure transducer, and transmit the dive log using the communications device.

The system (100) for positioning an underwater device (105, 110, 115, 120), comprises: at least two surface transponders (125, 130, 135) comprising a receiver (160) for receiving radio signals transmitted by a geolocation system (200); each surface transponder comprising: a means (180) for estimating at least one radio pseudo-distance; an attachment (185) to a float; and a means (140) for communicating information representative of the radio pseudo-distances; and an underwater acoustic transmitter (140); the underwater device comprising: a means (145) for receiving information representative of the radio pseudo-distances; an acoustic signal receiver (145); a means (150) for determining one or more acoustic pseudo-distances between at least two underwater acoustic transmitters and the underwater device; and a means (155) for calculating the position of the device in a terrestrial frame of reference centered on one of the surface transponders.

Disclosed are a system and method for undersea navigation with a maritime vehicle or diver undersea navigation device. A sensor interface receives navigation information from a plurality of sensors used to sense navigation information. A processor receives the navigation information from the sensor interface. The processor converts the navigation information into graphics data. The processor provides the graphics data to a graphics processing unit to render a navigation board image on a display of the maritime vehicle or diver undersea navigation device. The navigation board image comprises a plurality of navigation indicators to indicate the navigation information and a compass comprising a plurality of rotational orientation indicators to indicate rotational orientation information. The rotational orientation indicators include a plurality of heading direction indicators, a current heading indicator, and a plurality of pitch indicators, where the plurality of pitch indicators indicate pitch information.

It is described an emergency device (100) for divers comprising a watertight case (101) structured to assume a submerged position and an emerged position. The watertight case includes: a depth sensor (102) configured to determine a depth value associated with the submerged position assumed by the emergency device when a user activates an emergency procedure; a positioning device (103) configured to determine a geographic position, including latitude and longitude, assumed by the emergency device (100) in the emerged position; a GSM or satellite telephone transmitter/receiver (104) configured to transmit an emergency message comprising said depth value and said geographic position.

A scuba tank pressure monitor system comprises a scuba tank pod and a wearable electronic device. The scuba tank pod includes an air pressure detector, a first transducer element, and a first processing element. The air pressure detector detects an internal air pressure of the scuba tank. The first transducer element transmits sonar waves including scuba tank related status data having a first frequency range. The first processing element controls the first transducer element to transmit sonar waves including the scuba tank related status data. The wearable electronic device includes a second transducer element, and a second processing element. The second transducer element receive sonar waves including the scuba tank related status data from the scuba tank pod and transmits sonar waves including alert tones having a second frequency range. The second processing element controls the second transducer element to transmit sonar waves including the alert tones.

A diving computer with coupled antenna and a water contact assembly is disclosed. The diving computer has at least one radiator element located on or connected to an outermost surface of a bezel of the diving computer and a radio unit having a conductive coupling to said radiator element, for enabling wireless communication between said diving computer and external devices. A conductive water contact surface extends through the housing of the diving computer and a water contact detector circuit is arranged, as a part of an underwater condition sensing circuit, to sense an underwater condition of the device. When water establishes a current path through said underwater condition sensing circuit from the water contact surface to ground, the sensing circuit provides an indication of an underwater condition to the diving computer.

The embodiments disclose a lighting device configured for projecting at least a 180 degree halo of light using at least one component module having a LED/lens light pod module, a mount configured for a user to wear the lighting device on a user's hand, at least one external battery pack and a navigation light device with the lighting device, wherein the lighting device and the navigation light device are configured to project a 360 degree light pattern and at least one sensor configured to automatically activate a front LED/lens light pod module when the user raises and points a hand to gain a predetermined distance forward focused beam in a pointing direction, wherein the at least one sensor activates left and right side LED/lens light pod modules for projecting a light pattern to a front and rear direction when the user's arm is at one's side.

A system for use by a diver during an underwater dive. An autonomous underwater vehicle (one component of the system, AUV) comprises a component for detecting that the AUV has entered water, an AUV acoustic transceiver, a plurality of AUV sensors, a propulsion unit, a processor for determining dive information and diver information responsive to data from one or both of the AUV acoustic transceiver and the plurality of AUV sensors, and one or more cameras. Diver equipment carried by the diver comprises a plurality of diver sensors and a diver acoustic transceiver for receiving sensed information from the plurality of diver sensors and communicating the sensed information to the AUV, and for receiving information from the AUV acoustic transceiver.