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 Tuo 45° 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 is slid along the other to the drsired position. Durable,clear,vinylite.long side length 30 cm