The marine accident rate is still high and quite a few accidents are caused by irregular ship navigation. A certain level of ship navigation technology is covered by the Certificate of Competency, but it is not enough to realize safety navigation. On the other hand, the introduction of AIS enabled the acquisition of ship's track information easily. Using track information acquired from AIS, authors aim at the evaluation of each ship's navigation situation. In this paper, using information of ship's track, ship speed, number of other ships around own ship and the relative positional relations between the other ships, we find the characteristic of navigation situation in a specific sea area. We use this characteristic as a standard in the sea area, and using the difference from the standard we thought that we could evaluate the navigation situation of individual ships. By the results of investigation on the above elements in this paper, we get some kind of characteristic on each ship's navigation and the possibility of navigation evaluation was suggested.
