Abstract
Because of short of the utility and reliability, navigation equipments in automation ships are not so suitable for ships members, but increase burden. So we inquiry into the ratio of utility, necessity and reasons of the failure, found out as follow. 1. There are not so big difference between automation ships and others in navigation equipments. 2. About 77% of failures are caused by electrical and mechanical. 3. About 40% of failures could not repair on board. 4. In order to research the reliability of ship's equipments, we should record every troubles and its details of each ship.
