Manual Lowrance X135 (page 14 of 208) (English, Dutch)

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9, so you can mount your unit and plug in the power. Or you might

want to see how our text formatting makes the manual tutorials easy to

skim. If that's the case, move on to "How to Use This Manual" on page

8. But, if you want to understand the current state of satellite

navigation, look over this segment describing how GPS and its new

companion WAAS work together to get you where you're going.

The Global Positioning System (GPS) was launched July 17, 1995 by

the United States Department of Defense. It was designed as a 24-

hour-a-day, 365-days-a-year, all weather global navigation system for

the armed forces of the U.S. and its allies. Civilian use was also

available, but it was less accurate because the military scrambled the

signal somewhat, using a process called Selective Availability (SA.)

GPS proved so useful for civilian navigation that the federal

government discontinued SA on May 2, 2000, after the military

developed other methods to deny GPS service to enemy forces. Reliable

accuracy for civilian users jumped from 100 meters (330 feet) under SA

to the present level of 10 to 20 meters (about 30 to 60 feet.)

Twenty-four satellites orbit 10,900 nautical miles above the Earth,

passing overhead twice daily. A series of ground stations (with precisely

surveyed locations) controls the satellites and monitors their exact

locations in the sky. Each satellite broadcasts a low-power signal that

identifies the satellite and its position above the earth. Three of these

satellites are spares, unused until needed. The rest virtually guarantee

at least four satellites are in view nearly anywhere on Earth at all times.

A minimum of three satellites are required to determine a 2D fix.

The system requires signal reception from three satellites in order to

determine a position. This is called a 2D fix. It takes four satellites to

determine both position and elevation (your height above sea level —

also called altitude). This is called a 3D fix.

Remember, the unit must have a clear view of the satellites in order to

receive their signals. Unlike radio or television signals, GPS works at

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Lowrance X135 Manual

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