Abstract
High speed vessels transportation will be in operation in a few years at congested sea area. So it is important to evaluate the safety of navigation including high speed vessels there. In this paper, we studied the characteristic of risk due to high speed manoeuvre at congested sea area, and proposed the basic idea concerning risk evaluation method. At first, we carried out some experimental studies using a real-time ship handling simulator, and obtained the following results. (1) The limit of mariner's information processing ability is related to the frequency of encountered vessels that mariner should pay attention. (2) Reducing own speed gives the allowance on time to process information about other vessels because encounter frequency decreases. However, there is appropriate speed of high speed vessels meeting with congested traffic environment. Finally, we found that there are two main factors which caused risk of navigation, mariner's information processing ability and ship handling ability. And we considered that it was effective to analyze the relation of these two factors in order to evaluate the risk of high speed navigation at congested waters.
