horizontal angle
The angle measured between two fixed objects (usually on shore) to aid in finding a boats position by determining the arc of a circle on which the boat must lie.
horseshoe buoy ...
horizontal angle - When using a sextant, it is the angle established between landmarks, thus providing a line of position.
SHAFT ANGLE The angle between the center line of the shaft and the center line of the ship is the horizontal angle and the angle between the center line of the shaft and either the base line or the designed waterline is the vertical angle.
As the sheet is loosened to increase the horizontal angle of the boom and sail, the sheet becomes horizontal and exerts less downward force.
 See also: Boat, Line, Horizon, Point, Rope
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