thales-navigation meridian series 用户手册

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True North

The direction to North Pole from an observer’s

position.  The north direction on any geographical

meridian.

UTC

Universal Time Coordinated. Formerly referred to as

Greenwich Mean Time (GMT).

UTM

Universal Transverse Mercator metric grid system

used on most large and intermediate scale land

topographic charts and maps.

VMG

Velocity Made Good.  The component of the velocity

that is in the direction of the destination.

WPT

Waypoint.  A location saved in the receiver’s memory

which is obtained by entering data, editing data,

calculating data or saving a current position.  Used to

create routes.

XTE

Cross Track Error.  The perpendicular distance

between the present position and the courseline.

Given as a distance, right or left, of course when

facing the destination.