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Garmin GPS 120 User Manual

Page 11

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Basic

The GPS 120 is a powerful navigation tool that can guide you anywhere in

the world. To better understand its operation and capabilities, it may be help­
ful to review the basic terms and concepts briefly explained below,

Navigatian

is the process of traveling from one place to another and knowing

where you are in relation to your desired course.

Position

is an exact, unique location based on a geographic coordinate system.

Marine navigation is based on the latitude/lon^iude coordinate system.

Meridians of longitude

are a set of imaginary circles around the earth that pass

through the north and south poles. Longitude describes position in terms of how

many degrees it is east or west of the Prime Meridian fO" longitude).

Parallcb oflatitude

are anotherset of imaginary circles that ate perpendicular

to the earth’s polar axis. Latitude describes position in terms of how many

degrees it is north or south of the equator (0” latitude).

A

waypoint

marks an exact position fix so it can be recalled for future use. The

GPS 120 lets you mark waypoints electronically, without physical landmarks.

Bearing

is a compass direction to a particular destination (waypoint) from your

present position.

Track

is a compass direction representing your course over ground.