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Made of transparent plastic,“Inoue" and “Kent" types are available. 1. Inoue Type: Nautical Triangles, a position finder for the navigator, consisting of a danger-angle triangle (A) and a protractor triangle (B) made of transparent plastic, 36 cm. 2. Kent Type: Two 45o triangles provide an easy method for plotting position and course and doing other chart work. Using protractor scales, the triangle is easily aligned in any direction with a chart meridian. Direction is maintained as one triangle is slid along the other to the desired position. Durable, clear, vinylite. Long side length 30 cm.

航海三角板分為INOUE-TYPE 360mm和KENT-TYPE 300mm,由透明塑料制成,船舶上都配有兩只同規(guī)格的航海三角板。根據(jù)不同情況，可單獨(dú)使用或兩只配合使用。在應(yīng)用中，航海三角板比平行尺方便、靈活。特別是在量取的方位線或航向線度數(shù)，但又與海圖上的羅經(jīng)花距離較遠(yuǎn)時(shí)，使用航海三角板量取方位線或航向線的度數(shù)就更為方便。具體操作時(shí)，用一只三角板的長(zhǎng)邊對(duì)準(zhǔn)所要量取的方位線或航向線，然后與另一只三角板配合，將對(duì)準(zhǔn)方位線或航向線的長(zhǎng)邊平行移到就近的經(jīng)度線上，使圓弧的中心點(diǎn)與經(jīng)度線相重合，最后從圓弧刻度尺上讀取方位或航向度數(shù)。在這種情況下，使用平行尺，則需要平行移動(dòng)較遠(yuǎn)的距離才能到羅經(jīng)花上，操作不慎，靜尺容易移位而產(chǎn)生誤差。