Garmin echoMAP 40 Series, Руководство пользователя и справочник

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Introduction
GPS
Definitions
3
Grid
A coordinate system that projects the earth on a flat surface, using
square zones for position measurements. UTM/UPS and Maidenhead
formats are grid systems.
Ground Speed
The velocity you are traveling relative to a ground position.
Latitude
A north/south measurement of position perpendicular to the earth’s
polar axis.
Longitude
An east/west measurement of position in relation to the Prime
Meridian, an imaginary circle that passes through the north and south
poles.
Navigation
The process of travelling from one place to another and knowing
where you are in relation to your desired course.
Position
An exact, unique location based on a geographic coordinate system.
Track (TRK)
The direction of movement relative to a ground position.
Universal Transverse Mercator(UTM)
A grid coordinate system that projects global sections onto a flat sur-
face to measure position in specific zones.
Velocity Made Good (VMG)
The speed you are traveling in the direction of the destination.
Waypoint
A specific location saved in the receiver’s memory.
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