2.2 Concept of Ship Operation System and Human Hunction of Present IBS

An incentive to modernize ship operation system by utilizing new technologies was the needs to decrease crew numbers and to reduce human errors.

2.2.1 Concept

The object of IBS design is stated as follows.

○ Not to increase work-loads of a human operator.

IBS being a support system, it needs to substitute the function of human, numbers of which have been reduced, so as not to increase work-loads of one-man operator.

○ Securing safety

To decrease human errors occurred in conventional ships, it needs to have support contents to compensate weak points of human characteristics.

Setting the above stated points as the object, development of IBS was initiated promptly using technologies currently available. However, as present technologies are insufficient in some aspects, present IBS is not an ideal support system yet. Therefore, it still requires human function in many cases.

2.2.2 Human function

Present IBS is designed to support mainly the following three maneuvering patterns.

Support for automatic tracking maneuver

This function is to navigate a planned route. The contents of this support are divided roughly into position estimation and automatic tracking. All the functions executed by human in conventional ships are subsituted except for decision making, provided that a ship operator need execute the following tasks when he operates the present system. When a ship approaches a point to alter her course, the operator needs to check on safety of the surroundings as well as to confirm whether the system is recognizing the planned route and to make an order to alter the course.

(Table 1) Human Functions in Conventional Ship Operation

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