True Course, True Bearing, Relative Bearing.

True Course is the direction of travel of the vessel. Also, is the dihedral angle formed between the True Meridian Plane and the Longitudinal Centre Plane of the vessel. (more…)

Dividing of Horizon in Compass Points.

Dividing of Horizon in Compass Points is no longer used in navigation than for to indicate the approximate directions such as wind direction, current direction, etc. (more…)

Dividing of Horizon in Degrees. Conversion.

Dividing of Horizon in Degrees is for determining directions at sea and is made in relation to certain plans and main lines. (more…)

Dip of the Sea Horizon.

Dip, Depression or Inclination of the Visible Horizon (Dip of the Sea Horizon) is the vertical angle between the True Horizon Plane and the direction to the Visible Horizon. (more…)

Corrected Visibility Distance.

To find out the Corrected Visibility Distance to an object is necessary to apply a correction to the visibility distance given on the charts. (more…)