Station keeping in ice covered waters must react to forces caused by drifting ice. The reaction forces from a station keeping system can be generated by dynamic positioning in light ice conditions. In more severe ice conditions, only mooring can create large enough forces to counteract the ice forces. An intermediate system is DP assisted mooring where DP controls the heading towards ice drift. The paper describes various station keeping methods and their operational envelopes in terms of ice conditions. Further, methods to estimate the operational envelopes are described. The effect of ice management on the operational envelope is considered. Finally, the future development of methods to estimate the operational envelopes of station keeping systems are described as well as development in station keeping systems.
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