Abstract
We studied optimal routing to the destination when inshore ships will encounter rough sea. The route is to get minimum-time paths through a region of position-dependent vector velocity by optimization for dynamics systems. The ship speed reduction by wave height and direction in addition to ocean current was taken in this paper. The data area is 400 miles from east to west and 300 miles from north to south. The lattice points are divided into every 50 miles and 30 miles along X and Y-axis. These data are based on wave prognosis chart and sea surface current chart near Japan by weather facsimile. We are comparing the optimal routing with the direct routing to prove the validity of this method.
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