danger angle

American  

noun

Navigation.

1. 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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Etymology

Origin of danger angle

First recorded in 1890–95

Example Sentences

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."

From The Teaching of Geometry by Smith, David Eugene

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.

From The Teaching of Geometry by Smith, David Eugene

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.

From The Teaching of Geometry by Smith, David Eugene

Angle A is called the "horizontal danger angle."

From The Teaching of Geometry by Smith, David Eugene