This paper discusses the development of a stationkeeping analysis procedure which closely follows the requirements of the American Bureau of Shipping. It features a highly accurate consideration of the propulsion forces. The program is custom-designed for the specific application (vessel) and is intended to be installed on an onboard computer. This allows an accurate assessment at any time of the performance of the vessel for any combination of environmental forces (wind, current, waves) in magnitude and direction, including varying external loads, e.g., pipe tension for a pipe-laying vessel. Also discussed are hydrodynamic topics related to the stationkeeping capabilities, such as thruster-thruster interaction effects and cross-coupled forces generated by thrusters operating in oblique inflow angles.

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