Memorex RX 1 Smart Manual de Instalação descarregar pdf (Página 188)

186 | Appendix E - Glossary

CENTRAL MERIDIAN

The meridian (see MERIDIAN) that passes through the center of the referenced

grid (Zero longitude).

CHARACTER STRING

Contiguous characters (other than spaces) in a message.

CHECKSUM

The value sent with a binary-coded message to be checked at the receiving end to

verify the integrity of the message.

CLICK (KEYBOARD)

The audible tone generated when a key is activated.

CLOCK

A precisely-spaced, stable train of pulses generated within an electronic system to

synchronize the timing of digital operations within the system.

CLOCK OFFSET

The differences between the times at the CDU/processor tracking a satellite, the

satellite itself, and GPS system time.

C/A CODE

See COARSE/ACQUISITION CODE

COARSE/ACQUISITION (C/A) CODE

The NAVSTAR satellite signal that may be accessed by civilian members of the

user community.

COEFFICIENT OF EARTH FLATTENING

The value F that quantitatively describes by how much the earth’s ellipsoid

semimajor axis (A) is shorter than the semiminor 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 clockwise 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, magnetic, 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.

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