In modem navigation, great attention is paid to the Safety of Navigation. There are a lot of effective DSS that solve the problem of automated route planning and create a passage plan. One of the main issues of Passage Planning Stage - “appraisal” - is the assessment of the whole area of navigation chart and highlighting all necessary information, concerning the safety of the voyage. Never the less, such systems do not fully solve it or isn’t assess it at all. This article describes the issues of determining the boundary of safe voyage and plotting “No go area” by interpolating isobaths represented by a tabular value matrix, and selecting it such an approximation of a function in various ways that best describes and analyzes the distribution of physical process. Also, on more question is described: the article demonstrates the issue of dynamic-assessed situation of a ship’s approaching to the dangerous is obath by setting a virtual force- field of “repulsive force” by the sigmoid function in navigation stagesin vicinity of such areas to increase the standards of the Safety of Navigation.
approximation, isobath, security parameters, cubic spline, “No go Area”, NGA, sigmoid function, virtual repulsion field
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