Leica MX400 Operating Instructions Manual page 211

Operator's Manual
The value F that quantitatively describes by how much the
earth's ellipsoid semimajor axis (A) is shorter than the semimi-
nor axis (B). F = (A-B)/A.
COG
See COURSE OVER GROUND
COMPASS BIAS
Angle of misalignment between the steering compass and the
keel line of the vessel or long axis of the vehicle.
COMPASS DEVIATION
See DEVIATION.
COMPASS HEADING
Compass reading before correction for deviation and variation.
COMPASS MAGNETIC VARIATION
See MAGNETIC VARIATION.
COURSE
The horizontal direction in which a vessel is steered or intended
to be steered, expressed as angular distance from north clock-
wise through 360°. (Strictly the term applies to direction
through the water, not the direction intended to be made good
over the ground). The course is often designated as true,
magnetic, or compass as the reference direction is true, mag-
netic, or compass, respectively.
COURSE LINE
A line, as drawn on a chart, extending in the direction of a
course (Rhumb Line).
COURSE OVER GROUND
Course made good relative to the sea bed.
CROSS TRACK ERROR (XTE)
The perpendicular distance from the vessel to the actual course
line (track) as defined in the active route.
CURSOR
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Glossary
Version 3.3