| 摘要 |
PROBLEM TO BE SOLVED: To provide a direction finding system capable of simply carrying to a high altitude such as a steel tower and accurately measuring an azimuthal angle of an installation such as an antenna. SOLUTION: A substrate having an engaging part to be engaged with an object to be measured is provided. An upright axis is provided on the substrate, and in addition, a line passing through the axis is drawn on a surface of the substrate to form a directional line of the line. A protractor having four points of the compass marked is rotatably put over the axis. A true north measuring device is provided on the protractor with its true north indicating part aligning with a position indicating the north of the protractor. The true north measuring device is rotated together with the protractor, and while the true north indicating part is directed in the true north direction, a difference in angle between the true north and the directional line can be measured by the protractor. COPYRIGHT: (C)2008,JPO&INPIT
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