| 摘要 |
PROBLEM TO BE SOLVED: To automatically set an absolute bow azimuth angle signal measured by a gyroscope device to a navigation system or the like during restoration from a power failure or the like. SOLUTION: During restoration from a power failure, when an inboard power alarm signal U from an inboard power alarm device 14 becomes a level condition representing release, a power failure absolute bow azimuth setting means 18c automatically steps an absolute bow azimuth based upon the absolute bow azimuth angle signal X provided from the gyroscope 12 to a bow azimuth setting part 18b. Then a bow azimuth calculating part 18a can properly calculate a bow azimuth W by adding and subtracting a bow azimuth angle change signal V from this set absolute bow azimuth. |
