| 摘要 |
PROBLEM TO BE SOLVED: To provide a composite navigation device rationally improved in detection precision of course azimuth by geomagnetism. SOLUTION: This composite navigation device 1000 performs the display of navigating state of a vessel 900 or the steering thereof according to a corrected satellite radio course azimuth value CD1a at a prescribed speed value or more or a geomagnetic course azimuth value CD2 when it is not so. The detected angleθby a geomagnetic azimuth detection part 300 at the prescribed speed or more is corrected by using the difference between the detected angleθand the corrected satellite radio course azimuth value CD1a by a satellite radio receiving part 100 and correcting radio receiving part 130 as an error valueΔθ, whereby the geomagnetic course azimuth value CD2 from the due north 0 deg. is obtained. The error valueΔθobtained in a prescribed period, for example, just after the installation of the composite navigation device 1000 is stored in an error data memory part as the correction value to the detected angle valueθof the whole circumference. Every time when the error valueΔθis obtained, the correction value to the individual detected angle valueθis restored. The error valueΔθcan be thus regularly renewed to improve the precision of the geomagnetic course azimuth value CD2.
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