Abstract
If there were no traffic regulations on the water, a ship could go freely. So, she would have wide choice of routes and course lines on the way to the destination. And if we could set the course line automatically, and it were efficient and safe one, not merely it would lighten burden on the navigator, but aid her to avoid running ashore. In this paper, the authors proposed the algorithm to set the tactical route and the strategic course line, and analyzed the navigator's Subjective risk Judgement for Land (SJ_L) which based on experiments using maneuvering simulator. Moreover, the authors studied what SJ_L level the navigator adopted on common navigation. Finally, some examples of the course line which based on the automatic setting procedure were indicated.
