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The maximum (or minimum) angle between two points, as observed from a craft indicating the limit of safe approach to an offlying danger. A horizontal danger angle is measured between points shown on the chart. A vertical danger angle is measured between the top and bottom of an object of known height.



Related Terms

VERTICAL DANGER ANGLE

The maximum or minimum angle between the top and bottom of an object of known height, as observed from a craft, indicating the limit of safe approach to an offlying danger.

HORIZONTAL DANGER ANGLE

The maximum or minimum angle between two points on a chart, as observed from a vessel, indicating the limit of safe approach to an off-lying danger.

MAXIMUM GRADABILITY

Steepest slope a vehicle can negotiate in low gear; usually expressed in precentage of slope, namely, the ratio between the vertical rise and the horizontal distance traveled; sometimes expressed by the angle between the slope and the horizontal.

ANGLE OF DEPRESSION

The angle in a vertical plane between the horizontal and a descending line. Also called DEPRESSION ANGLE.

STOOPING

Apparent decrease in the vertical dimension of an object near the horizon, due to large inequality of atmospheric refraction in the line of sight to the top and bottom of the object.

GEOMETRICAL DIP

The vertical angle between the horizontal and a straight line tangent to the surface of the earth. It is larger than DIP by the amount of terrestrial refraction.

ANGLE OF ELEVATION

The angle in a vertical plane between the horizontal and an ascending line, as from an observer to an object. A negative angle of elevation is usually called an ANGLE OF DEPRESSION. Also called ELEVATION ANGLE

TOWERING

Apparent increase in the vertical dimension of an object near the horizon, due to large inequality of atmospheric refraction in the line of sight to the top and bottom of the object.

CRITICAL SLOPE

The maximum angle with the horizontal at which a sloped bank of soil of a given height will remain undeformed without some form of support.

CELLULAR VESSEL

ship constructed for transportation of containers stacked on top of each other in vertical guide shafts, no general freight is carried.

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