Memorex RX 1 Smart Manual de Instalação descarregar pdf (Página 239)

238 | Simrad MX500

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.

CURSOR

A flashing rectangle superimposed on a character posi-

tion in the display window, indicating that a character

may be entered in that position, or that the existing

character may be changed via the keyboard.

DATUM

The framework on which the coordinates used to define

position on the Earth’s surface are based. In the naviga-

tor, a datum is defined by the following parameters:

A and I/F. Size and shape of a reference ellipsoid.

DX, DY, DZ. Position of the reference ellipsoid origin in

relation to the satellite datum ellipsoid origin.

DEAD RECKONING

The process of determining changes of position based on

measured speed and course over measured time periods.

DECCA LINES OF POSITION (LOPs)

The phantom Decca Lines of Position used in the naviga-

tor are based on mathematical models. Local deviations

in propagation speed are not included. The calculated po-

sitions may therefore differ from positions obtained from

dedicated Decca receivers by several hundred meters.

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Memorex RX 1 Smart Manual de Instalação Página 239