A system and method that reduces spatial positioning control requirements for maintaining reduced wave-making resistance of at least one following vessel in a fleet operating in a seaway, by determining a position of the at least one following vessel within a coordinated zone, which is a zone within a reduced wave-making resistance region of the Kelvin wake of at least one lead vessel, at which a surge motion of the vessels is synchronized with each other. By positioning the at least one following vessel in the coordinated zone, the spatial positioning control requirements of the at least one following vessel can be reduced.

A system and method that reduces spatial positioning control requirements for maintaining reduced wave-making resistance of at least one following vessel in a fleet operating in a seaway, by determining a position of the at least one following vessel within a coordinated zone, which is a zone within a reduced wave-making resistance region of the Kelvin wake of at least one lead vessel, at which a surge motion of the vessels is synchronized with each other. By positioning the at least one following vessel in the coordinated zone, the spatial positioning control requirements of the at least one following vessel can be reduced.

The disclosure provides a method and system to monitor and advise the status of a group of floating platforms, such as offshore floating wind platforms, by using a floating platform's motion in the group and detect one or more anomalies to identify one or more disorders (including irregularities) in the group. Input for this method can include information of wind speed and direction and orientations of the wind turbine nacelles. The orientation of the platform can complement the orientation of a wind turbine nacelle on the platform in case the platform is equipped with a turret. Disorders include, but not limited to, mooring line failure, shifts of a drag anchor, other issues with the mooring system components such as fairleads, issues with the ballasting configuration of the floater, issues with the turret (if any), issues with the swivel of the nacelle, issues with the rotor, and issues with the blades.

A marine vessel management system to reduce the burden on a marine vessel rental business operator includes a marine vessel, an information processor, and a portable terminal device operable by a marine vessel user. When the marine vessel is leaving a port and/or when the marine vessel is returning to the port, the portable terminal device receives information about a state of the marine vessel via the information processor, and displays the received information about the state of the marine vessel.

A marine vessel management system to reduce the burden on a marine vessel rental business operator includes a marine vessel, an information processor, and a portable terminal device operable by a marine vessel user. When the marine vessel is leaving a port and/or when the marine vessel is returning to the port, the portable terminal device receives information about a state of the marine vessel via the information processor, and displays the received information about the state of the marine vessel.

A system for a traveling history report of a personal watercraft includes processing circuitry. The processing circuitry is configured to: generate traveling history data based on positional information indicating a position of the personal watercraft, the traveling history data including information indicating a movement route of the personal watercraft; and output the traveling history data.

A system for a traveling history report of a personal watercraft includes processing circuitry. The processing circuitry is configured to: generate traveling history data based on positional information indicating a position of the personal watercraft, the traveling history data including information indicating a movement route of the personal watercraft; and output the traveling history data.

Provided is an estimation device that estimates a response at a position of a floating structure where a sensor detecting a structural response is not installed. The estimation device acquires a strain response spectrum at an installation position at which a strain sensor is installed on a floating structure, the strain response spectrum being calculated based on the strain sensor, a wave spectrum, and strain response functions at the installation position and at a non-installation position of the strain sensor, calculates a correction amount based on a predetermined formula expressing a relationship among the strain response spectrum, the wave spectrum, and the strain response functions, and adds the correction amount to a theoretical value of the strain response spectrum calculated from the strain response function and the wave spectrum at the non-installation position of the strain sensor to calculate the strain response spectrum at the non-installation position.

Systems, devices and methods enable generation and monitoring of support platform structural conditions in a manner that overcomes drawbacks associated with conventional approaches (e.g., load cells) for generating and monitoring similar operating condition information. In preferred embodiments, such systems, devices and methods utilize fiber optic strain gauges (i.e., fiber optic sensors) in place of (e.g., retrofit/data replacement) or in combination with conventional load cells. The fiber optic sensors are strategically placed at a plurality of locations on one or more support bodies of a support platform. In preferred embodiments, the fiber optic strain gauges are placed in positions within a hull and/or one or more pontoons of an offshore platform. Such positions are selected whereby resulting operating condition data generated by the fiber optic strain gauges suitably replaces data received by conventionally constructed and located load cells of an offshore platform (e.g., a TLP).

Disclosed is a detector 10 using a liquid spray 2000 for detecting electrical faults or shorts with the detector including a body 100 having an interior 120; a hose or pipe 130 fluidly connected to interior 120; a trigger valve 140 operatively connected to hose 130; a conductor 200 attached to detector 10; and/or a pump 110 fluidly connected to interior 120. In various embodiments the detector 10 can cause liquid spray 2000 to be sprayed on a subregion of an item such as a remotely operated vehicle to create a closed electrical circuit through the liquid spray and the conductor in the detector.