Garmin GPS Kit User Manual download pdf (Page 41)

Appendices

GPS - the Global Positioning System - is a

navigation revolution. It’s a technology that pinpoints a

user’s location anywhere in the world, 24 hours a day,

regardless of the weather.

Defense for use by the military, the GPS System was

made available to civilians for use in aviation, marine

surveying and general outdoor/ recreation markets.

Today, millions of people utilize the accuracy and

convenience of this amazing technology to hunt, fish,

hike, fly, cruise and sail. GPS consists of a constellation

of 24 satellites orbiting some 12,000 miles above the

earth.

These satellites transmit signals containing time and

orbital data to calculate satellite position and almanac

data. Meanwhile, receivers used on the ground, sea and

air search the sky for the satellites. The GPS unit needs

to acquire good signals from at least three satellites to

determine a position on the surface of the earth. A

fourth signal is required to get three-dimensional

positioning which determines elevation or altitude.

Appendix B

What is GPS?

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Garmin GPS Kit User Manual Page 41