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A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, for maintaining vessel position or velocity when in a dynamic control mode, comprises a position or velocity indicator to indicate vessel position or velocity or deviations

A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, for maintaining vessel position or velocity when in a dynamic control mode, comprises a position or velocity indicator to indicate vessel position or velocity or deviations in vessel position or velocity; such as a satellite-based positioning system indicator, or accelerometers as a relative position indicator, a heading indicator to indicate vessel heading from position heading or yaw rate or deviations in vessel heading or yaw rate, such as a compass as an absolute heading indicator or a yaw rate sensor as a relative heading indicator, and a controller to control the operation of the waterjet units to substantially maintain the vessel position or velocity, and vessel heading or yaw rate when the dynamic control mode is enabled.

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1. A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, the waterjet units comprising steering deflectors and reverse ducts and being operable in synchronism or differentially, the dynamic control system for maintaining vessel

1. A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, the waterjet units comprising steering deflectors and reverse ducts and being operable in synchronism or differentially, the dynamic control system for maintaining vessel position or velocity when in a dynamic control mode, comprising: a position or velocity indicator to indicate vessel position or velocity or deviations in vessel position or velocity;a heading indicator means to indicate vessel heading or yaw rate or deviations in vessel heading or yaw rate; anda controller to control the operation of the steering deflectors and reverse ducts of the waterjet units to substantially maintain vessel position and heading, or operation of the waterjet units to substantially maintain vessel velocity and yaw rate, when the dynamic control mode is enabled. 2. A dynamic control system for a marine vessel according to claim 1 wherein said position or velocity indicator comprises a velocity indicator to indicate absolute vessel ground velocity. 3. A dynamic control system for a marine vessel according to claim 2 wherein said position or velocity indicator is arranged to indicate velocity via a satellite-based positioning system. 4. A dynamic control system for a vessel according to claim 1 comprising input means for enabling the dynamic control mode and setting a commanded vessel position or velocity and a commanded vessel heading or yaw rate. 5. A dynamic control system for a marine vessel according to claim 4 wherein the controller is arranged to monitor for position or velocity deviations relative to the commanded vessel position or velocity and for heading or yaw rate deviations relative to the commanded vessel heading or yaw rate and to control the operation of the waterjet units to minimise position or heading error, velocity or yaw rate error, when the dynamic control mode is enabled. 6. A dynamic control system for a marine vessel according to claim 1 including input means which enables setting of a current position or velocity and a current heading or yaw rate of the vessel as a commanded vessel position or velocity and a commanded vessel heading or yaw rate. 7. A dynamic control system for a marine vessel according to claim 1 including input means which enables a setting of position or velocity and heading or yaw rate which is different from a current vessel position or velocity and heading or yaw rate as a commanded vessel position or velocity and a commanded vessel heading or yaw rate. 8. A dynamic control system for a marine vessel according to claim 1 wherein the commanded vessel position or velocity and the commanded vessel heading or yaw rate can be altered while the dynamic control mode is enabled. 9. A dynamic control system for a marine vessel according to claim 1 wherein any one or more of the commanded vessel position, velocity, heading or yaw rate can be altered via a joystick, a helm wheel, and/or throttle lever(s). 10. A dynamic control system for a marine vessel according to claim 1 wherein said position or velocity indicator comprises a position indicator to indicate absolute vessel ground position. 11. A dynamic control system for a marine vessel according to claim 10 wherein said position or velocity indicator is arranged to indicate position via a satellite-based positioning system. 12. A dynamic control system according to claim 1 wherein the controller is arranged to controllably vary the engine thrust of the waterjet units when the dynamic control mode is enabled. 13. A dynamic control system for a marine vessel according to claim 1 wherein said position or velocity indicator comprises a position indicator to indicate relative position by indicating deviations in vessel position relative to a commanded vessel reference position. 14. A dynamic control system for a marine vessel according to claim 13 wherein the position indicator comprises an accelerometer. 15. A dynamic control system for a marine vessel according to claim 1 wherein said position or velocity indicator comprises a velocity indicator to indicate relative velocity by indicating deviations in vessel velocity relative to a commanded vessel reference velocity. 16. A dynamic control system for a marine vessel according to claim 15 wherein the velocity indicator comprises an accelerometer. 17. A dynamic control system for a marine vessel according to claim 1 wherein said position or velocity indicator is arranged to indicate vessel position or velocity relative to another stationary object. 18. A dynamic control system for a marine vessel according to claim 17 wherein said position or velocity indicator is arranged to indicate vessel position or velocity relative to another stationary object via a radar, acoustic, or laser range finding system. 19. A dynamic control system for a marine vessel according to claim 1 wherein said position or velocity indicator is arranged to indicate vessel position or velocity relative to another moving object. 20. A dynamic control system for a marine vessel according to claim 19 wherein said position or velocity indicator is arranged to indicate vessel position or velocity relative to another moving object via a radar, acoustic, or laser range finding system. 21. A dynamic control system for a marine vessel according to claim 1 wherein the heading indicator means is arranged to indicate absolute heading. 22. A dynamic control system for a marine vessel according to claim 21 wherein the heading indicator means comprises a compass. 23. A dynamic control system for a marine vessel according to claim 21 including a sensor to indicate changes in heading relative to a commanded vessel heading. 24. A dynamic control system for a marine vessel according to claim 1 wherein the heading indicator means comprises a yaw rate sensor. 25. A dynamic control system for a marine vessel according to claim 24 wherein the yaw rate sensor is arranged to indicate either absolute yaw rate or changes in yaw rate relative to a commanded vessel yaw rate. 26. A dynamic control system for a marine vessel according to claim 1 wherein the controller is arranged to controllably actuate the engine throttles and steering deflectors and reverse ducts of the waterjet units. 27. A dynamic control system for a marine vessel according to claim 1 wherein the controller is arranged to actuate the steering deflectors of the waterjet units in synchronism, and the reverse ducts either in synchronism or differentially. 28. A dynamic control system for a marine vessel according to claim 1 wherein the heading indicator means is arranged to indicate relative heading. 29. A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, the waterjet units comprising steering deflectors and reverse ducts and being operable in synchronism or differentially, the dynamic control system for maintaining at least vessel position when in a dynamic positioning mode, comprising: accelerometers arranged to indicate deviations in vessel position;a yaw rate sensor arranged to indicate deviations in vessel heading; anda controller to control the operation of at least the steering deflectors and reverse ducts of the waterjet units to substantially maintain vessel position and heading when the dynamic control mode is enabled. 30. A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, the waterjet units including steering deflectors and reverse ducts and being operable in synchronism or differentially, the dynamic control system for maintaining at least vessel position when in a dynamic positioning control mode, comprising: a position indicator to indicate deviations in vessel position via a satellite-based positioning system;a compass and a yaw rate sensor to indicate deviations in vessel heading; anda controller to control the operation of at least the steering deflectors and reverse ducts of the waterjet units to substantially maintain vessel position and heading when the dynamic control mode is enabled. 31. A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, the waterjet units comprising steering deflectors and reverse ducts and being operable in synchronism or differentially, the dynamic control system for maintaining vessel position when in a dynamic position control mode, and for maintaining vessel velocity when in a dynamic velocity control mode, comprising: position and velocity indicators to indicate vessel position and velocity or deviations in vessel position or velocity, or a combined indicator for indicating both vessel position and velocity or deviations in both vessel position and velocity;heading indicator means to indicate vessel heading and yaw rate or deviations in vessel heading and yaw rate, or a combined indicator for indicating both vessel heading and yaw rate or deviations in both vessel heading and yaw rate; anda controller to control the operation of the steering deflectors and reverse ducts to substantially maintain vessel position and heading, or operation of the waterjet units to substantially maintain vessel velocity and yaw, rate when the dynamic control mode is enabled. 32. A computer-implemented method for dynamically controlling a marine vessel propelled by two or more waterjet units which are the primary propulsion system of the vessel, the waterjet units comprising steering deflectors and reverse ducts and being operable in synchronism or differentially, the method comprising the steps of: (a) determining a commanded vessel position or velocity and a commanded vessel heading or yaw rate;(b) determining a current vessel position or velocity using a position or velocity determining means;(c) determining a current vessel heading or yaw rate using a heading or yaw rate determining means; and(d) controlling at least the steering deflectors and the reverse ducts of the waterjet units to substantially maintain the commanded vessel position and heading, or controlling the waterjet units to substantially maintain the commanded vessel velocity and yaw rate. 33. A method for dynamically controlling a marine vessel according to claim 32 also including the steps of: (e) receiving a commanded vessel position or velocity, and a commanded vessel heading or yaw rate;(f) calculating a position or velocity error based on the difference between the commanded vessel position or velocity, and current vessel position or velocity;(g) calculating a heading or yaw rate error based on the difference between the commanded vessel heading or yaw rate and current vessel heading or yaw rate; and(h) controlling the waterjet units to minimise the position and/or heading error, or velocity and/or yaw rate error. 34. A dynamic control system for a marine vessel having two or more waterjet units as the primary propulsion system of the vessel, for controlling vessel acceleration and/or deceleration when in a dynamic control mode, comprising: an acceleration indicator to indicate vessel acceleration and/or deceleration or deviations in vessel acceleration and/or deceleration;a heading indicator means to indicate vessel heading or yaw rate or deviations in vessel heading or yaw rate; anda controller to control the operation of the waterjet units to substantially maintain the vessel acceleration and/or deceleration and vessel heading or yaw rate, when the dynamic control mode is enabled. 35. A dynamic control system for a marine vessel according to claim 34 wherein the controller is arranged to monitor for acceleration and/or deceleration deviations relative to a commanded acceleration and/or deceleration and for heading or yaw rate deviations relative to a commanded vessel heading or yaw rate and to control the operation of the waterjet units to minimise acceleration and/or deceleration error and heading or yaw rate error when the dynamic control mode is enabled.