Memorex RX 1 Smart Manual de instalación descargar pdf (Pagina 189)

Appendix E - Glossary | 187

CURSOR

A flashing rectangle superimposed on a character position in the display window,

indicating that a charac ter 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 navi gator, 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 navigator are based on

mathematical models. Local deviations in propagation speed are not included.

The calculated positions may therefore differ from positions obtained from

dedicated Decca receivers by several hundred meters.

DEFAULT

A condition that the navigator assumes automatically if no other condition is

initiated by the operator.

DEVIATION (COMPASS)

Magnetic compass reading error due to local magnetic field influences.

DGPS

See DIFFERENTIAL GPS.

DIFFERENTIAL GPS (DGPS)

A method of refining GPS position solution accuracy by modifying the locally

computed position solution with correction signals from an external reference GPS

CDU (monitor).

DILUTION OF PRECISION (DOP)

A figure of merit for the quality of GPS-derived position and clock bias estimates,

based on the geometry of the selected satellite constellation. The smaller the

DOP, the less the magnification of the range measurement error into position and

clock bias errors. Generally, the more spread out the satellites, the lower the DOP.

The most common DOPs are as follows:

HDOP - Horizontal dilution of precision.

GDOP - Geometric dilution of precision.

PDOP - Position dilution of precision.

VDOP - Vertical dilution of precision.

EARTH FLATTENING COEFFICIENT

See COEFFICIENT OF EARTH FLATTENING.

ECDIS (Electronic Chart Display and Information System)

EDIT

To modify existing display data via the keyboard.

EDIT MODE

The state in the navigator where it is possible to enter or change data. EDIT

MODE is accessed by pressing the E-key. Press the E-key once more to ENTER the

data into the memory and leave EDIT MODE.

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