Manual Garmin GPS II Plus (page 8 of 112) (English)

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Satellite Acquisition

Because the GPS II

relies on satellite signals to provide you with navigation

guidance, the receiver needs to have an unobstructed, clear view of the sky for best

performance. In a nutshell, the GPS receiver’s view of the sky will generally deter-

mine how fast you get a position fix—or if you get a fix at all. GPSsignals are rela-

tively weak and do not travel through rocks, buildings, people, metal, or heavy tree

cover, so remember to keep a clear view of the sky at all times for best performance.

Once the GPS II

has calculated a position fix, you’ll usually have anywhere from

four to twelve satellites in view. The receiver will then continuously select the best

satellites in view to update your position. If some of the satellites in view get blocked

or “shaded,” the receiver can simply use an alternate satellite to maintain the position

fix. Although a GPS receiver needs four satellites to provide a three-dimensional (3D)

fix, it can maintain a two-dimensional (2D) fix with only three satellites. A three-

dimensional fix means the unit knows its latitude, longitude, and altitude, while a

two-dimensional fix means the unit knows only its latitude and longitude.

To prevent accidental battery

power loss, the GPS II

will

automatically shut off 10 min-

utes after the last keystroke if

the unit is not tracking at least

one satellite and has not

acquired a position fix.

gps ii + Mon (final?) 2/9/98 4:24 PM Page 2

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Garmin GPS II Plus Manual

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