Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.

Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.

Abstract: A leader system for time synchronizing includes an interface and a processor. The interface is configured to receive a time standard. The processor is configured to determine whether a time jump is necessary in response to the time standard; and in response to determining that the time jump is necessary: 1) cause overwriting a sensor data buffer; 2) provide an indication to unregister one or more follower devices from a leader device; and 3) time jump a leader device time in response to the time standard.

Abstract: A communication system comprising a communication unit having a local wireless communication mechanism, a remote wireless communication mechanism, a processor, and a power supply; and, at least one of a sensor unit having a sensor mechanism, a local wireless communication mechanism and a power supply. Each of the communication unit and at least one sensor unit is provided in a discreet housing and can be arranged proximal to each other unit to form a cluster. Each local wireless communication mechanism can communicate data to each other local wireless communication mechanism within the cluster. The communication unit remote wireless communication mechanism is operable to communicate outwith the cluster.

Abstract: An underwater communications system is provided that transmits electromagnetic and/or magnetic signals to a remote receiver. The transmitter includes a data input. A digital data compressor compresses data to be transmitted. A modulator modulates compressed data onto a carrier signal. An electrically insulated, magnetic coupled antenna transmits the compressed, modulated signals. The receiver that has an electrically insulated, magnetic coupled antenna for receiving a compressed, modulated signal. A demodulator is provided for demodulating the signal to reveal compressed data. A de-compressor de-compresses the data. An appropriate human interface is provided to present transmitted data into text/audio/visible form. Similarly, the transmit system comprises appropriate audio/visual/text entry mechanisms.

Abstract: A flow monitoring system comprising a first temperature sensor located at a reservoir input for measuring input temperature of a fluid in an enhance oil recovery system, a second temperature sensor located at a reservoir output for measuring temperature of output fluid and a processor in communication with the first temperature sensor and the second temperature sensor wherein the first temperature sensor and the second temperature sensor are operable to measure temperature data and communicate the measured data to the processor. The flow monitoring system further comprises a first flow monitor sensor located at the reservoir input for measuring flow of input fluid and the second flow monitoring sensor located at the reservoir output for measuring output fluid flow wherein the first and second flow monitoring sensors are operable to communicate measured flow data to the processor.

Abstract: An underwater navigation system comprising a transmitter (12) for transmitting an electromagnetic signal, a receiver (14) for receiving an electromagnetic signal from the transmitter, and determining means for determining the position of the receiver relative to the transmitter using the received electromagnetic signal. The system determining means may determining the direction of propagation using field strength at three or more receiver locations by determining the direction of propagation by comparison of the field strength received at each antenna, or by comparison of the field strength received at three or more different receiver locations.

Abstract: A subsea structure monitoring system comprising a plurality of sensor nodes distributed across the subsea structure, each wireless node comprising a sensor unit, a processor unit, and transmission unit wherein the sensor unit comprises at least one sensor which is operable to measure at least one environment variable, the sensed data is processed by the processor unit and is operable to be transmitted onwards to a transmission unit.

Abstract: An underwater communications network comprising a plurality of communication nodes operable to wirelessly communicate with at least one other node in the network, each node having a transceiver and an observation mechanism wherein the observation mechanism is operable to monitor signals received by the transceiver and upon reception of a first predetermined tone the observation mechanism outputs a signal operable to adjust the node from a passive operation mode to an active operation mode. Each node can be a discreet underwater device.

Abstract: A leader system for time synchronizing includes an interface and a processor. The interface is configured to receive a time standard. The processor is configured to determine whether a time jump is necessary in response to the time standard; and in response to determining that the time jump is necessary: 1) cause overwriting a sensor data buffer; 2) provide an indication to unregister one or more follower devices from a leader device; and 3) time jump a leader device time in response to the time standard.

Abstract: A leader system for time synchronizing includes an interface and a processor. The interface is configured to receive a time standard. The processor is configured to determine whether a time jump is necessary in response to the time standard; and in response to determining that the time jump is necessary: 1) cause pausing of a collection of sensor data; 2) provide an indication to unregister one or more follower devices from a leader device; and 3) time jump a leader device time in response to the time standard.

Abstract: A flow monitoring system comprising a first temperature sensor located at a reservoir input for measuring input temperature of a fluid in an enhance oil recovery system, a second temperature sensor located at a reservoir output for measuring temperature of output fluid and a processor in communication with the first temperature sensor and the second temperature sensor wherein the first temperature sensor and the second temperature sensor are operable to measure temperature data and communicate the measured data to the processor. The flow monitoring system further comprises a first flow monitor sensor located at the reservoir input for measuring flow of input fluid and the second flow monitoring sensor located at the reservoir output for measuring output fluid flow wherein the first and second flow monitoring sensors are operable to communicate measured flow data to the processor.

Abstract: A wireless communication system network for use with at least one underwater structure, the said communication system network comprising a plurality of communications units disposed around the underwater structure, each communication unit comprising a wireless transmitter, and a wireless receiver, wherein each communication unit is arranged with communicable range of at least three other communication units to form a mesh of communication units operable to work as a network and each communication unit is operable to perform as a master communication unit to at least one of transmit and receive data from the communication system network. The network may extend across multiple static or mobile underwater structures and may be a dynamic network.

Abstract: A system for deleting map data comprises an interface and a processor. The interface is configured to determine a location associated with a device. The processor is configured to determine one or more map bundles to delete based at least in part on the location and delete the one or more map bundles.

Abstract: A system for deleting map data comprises an interface and a processor. The interface is configured to determine a location associated with a device. The processor is configured to determine one or more map bundles to delete based at least in part on the location and delete the one or more map bundles.

Abstract: A system for deleting map data comprises an interface and a processor. The interface is configured to determine a location associated with a device. The processor is configured to determine one or more map bundles to delete based at least in part on the location and delete the one or more map bundles.

Abstract: An underwater communications network comprising a plurality of communication nodes operable to wirelessly communicate with at least one other node in the network, each node having a transceiver and an observation mechanism wherein the observation mechanism is operable to monitor signals received by the transceiver and upon reception of a first predetermined tone the observation mechanism outputs a signal operable to adjust the node from a passive operation mode to an active operation mode. Each node can be a discreet underwater device.

Abstract: An antenna system for us in detecting electromagnetic and/or magneto inductive said antenna system further comprising at least two semi-conductor sensor arrays operable to detect in magnetic field component of the electromagnetic and/or magneto-inductive signals, the arrays arranged to be operable for tri-axial detection of the magnetic field component; at least two output means where an output means is associated with each sensor array and operable to output a signal indicative of the detected magnetic field; and detection means operable to receive said sensor array outputs and operable to act upon said received outputs to generate a signal indicative of the detected electromagnetic and/or magneto-inductive signal.

Abstract: The present invention relates to a transfer system for providing wireless data transfer, electrical power transfer and navigation between a mobile subsea vehicle and a deployed subsea station that uses acoustic and electromagnetic carrier signals for wireless communication and navigation. An inductive connector is provided for power transfer between mobile subsea vehicle and a deployed subsea station without conductive contact.

Abstract: An underwater system (10) comprising a transmitter (12) for broadcasting an electromagnetic synchronization signal and at least one node (14) that has a receiver for receiving that signal, the node being adapted to use the received signal for synchronization.