DANGER ANGLE Definition & Meaning

danger angle

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a horizontal or vertical angle, subtended by two points on shore, that provides a maximum or minimum angle between the points as observed from a vessel if it is to steer a safe course.

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First recorded in 1890–95

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Angle A is called the "horizontal danger angle."

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One of the many interesting exercises that may be derived from this theorem is seen in the case of the "horizontal danger angle" observed by ships.

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If a dangerous shoal A is near a headland H, the angle HAX is measured and is put down upon the charts as the "vertical danger angle."

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Ships coming near the headland are careful to keep far enough away, say at S, so that the angle HSX shall be less than this danger angle.

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