A method and system for heading control during ship-to-ship (STS) transfer of liquefied natural gas (LNG). A method for heading control during STS transfer of LNG while moored on a buoy includes berthing a floating storage regasification unit (FSRU) to a buoy at a forward end of the FSRU, holding a stern of the berthed FSRU at a first heading with a bow of the FSRU pointing into a current, docking an LNG carrier (LNGC) alongside the berthed FSRU, mooring the LNGC to the berthed FSRU in a double-banked configuration at the first heading, adjusting the first heading of the FSRU and moored LNGC to a second heading with the bow of the FSRU and a bow of the LNGC pointing into a swell, and transferring LNG from the LNGC to the FSRU while the FSRU and moored LNGC are pointed into the swell.

Methods and apparatus for monitoring windlass rotation are provided to determine the real time rate and length of rode release when anchoring a boat. The rotation can be monitored in real time using directional sound and/or electromagnetic radiation receivers and/or transmitter in a module attached to the windlass. Another windlass module can monitor windlass rotation using micro-electromechanical systems (MEMS) components such as accelerometers, magnetometers, gyroscopes, and/or inertial measurement units (IMU) to sense motion and/or position.

A method and system for heading control during ship-to-ship (STS) transfer of liquefied natural gas (LNG). A method for heading control during STS transfer of LNG while moored on a buoy includes berthing a floating storage regasification unit (FSRU) to a buoy at a forward end of the FSRU, holding a stern of the berthed FSRU at a first heading with a bow of the FSRU pointing into a current, docking an LNG carrier (LNGC) alongside the berthed FSRU, mooring the LNGC to the berthed FSRU in a double-banked configuration at the first heading, adjusting the first heading of the FSRU and moored LNGC to a second heading with the bow of the FSRU and a bow of the LNGC pointing into a swell, and transferring LNG from the LNGC to the FSRU while the FSRU and moored LNGC are pointed into the swell.

A method for determining a displacement of an anchor is provided. The method includes the steps of: determining an initial position of the anchor; and determining a displacement of the anchor. The step of determining the displacement of the anchor includes (i) measuring anchor velocity values, (ii) measuring at least one further physical quantity associated with the anchoring, (iii) deciding whether the anchor is at rest or in motion, wherein a value of the further physical quantity is taken into account in the decision, and (iv) integrating the velocity values over time during intervals when the anchor is deemed to be in motion.

An anchor rope system for an offshore device for fixing an offshore device to a subsea floor. The anchor rope system includes at least one anchor rope surrounded by at least one sheathing. The anchor rope system includes at least one condition sensor formed by at least one fiber optic cable.

An alert control system includes a memory, and a processor coupled to the memory, wherein the processor is configured to: receive a first input of an anchorage instruction or a second input indicating an anchorage state, and perform, in accordance with the first input or the second input, control to reduce a number of kinds of triggers which output an alert.

A multi-anchor depth control system for a boat or other watercraft having a line for securing anchors to the boat, at least two anchors attached at or near opposing ends of the line, a depth finder, and a controller configured to automatically adjust the amount of line released from the boat to maintain the anchors on the floor of the body of water in which the boat is floating, based upon information obtained from the depth finder.

The disclosed method measures a line angle of a mooring line connected to a floating object floating in a body of water, the mooring line being connected between the floating object and an anchoring body disposed in a bed of the body of water, in which the floating object is coupled to the mooring line by a line connector. The method includes: defining at least three data points each associated with a respective location on the mooring line; on the data points obtaining a value associated with the location on the mooring line; determining parameters of an equation describing an anchor line curve from the values associated with the location on the mooring line for the data points; calculating at a predetermined position on the mooring line a line angle of the mooring line from a derivative of the equation at the predetermined position based on the parameters.

A multi-anchor depth control system for a boat or other watercraft having a line for securing anchors to the boat, at least two anchors attached at or near opposing ends of the line, a depth finder, and a controller configured to automatically adjust the amount of line released from the boat to maintain the anchors on the floor of the body of water in which the boat is floating, based upon information obtained from the depth finder.

A control unit for automatically controlling at least part of an anchoring function of a marine vessel is arranged to obtain a predetermined relationship between keel depth and preferred distance from land for dropping anchor from the storage medium, to receive first sensor data indicative of a current distance between the marine vessel and land, to receive second sensor data indicative of a current keel depth of the marine vessel, to determine a suitable location and/or time period for dropping anchor based on the first sensor data, the second sensor data, and the predetermined relationship between keel depth and preferred distance from land for dropping anchor, and to control at least part of the anchoring function of the marine vessel based on the determined suitable location and/or time period for dropping anchor.