What is GPS

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What is GPS

• And How Does It Work?

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GPS The global positioning system
Handheld receiver
24 Satellites circling the earth
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Where am I?
You are right here.
But where is here?
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Where are you?

• Can you put it on a map?
• Can you return to it in the dark?
• If it is the best fishing spot on the lake can
  you find it again?

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Latitude and Longitude
Identifies any location on earth.
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Latitude

• 0 at the equator
• 90N at the North Pole
• What latitude is Stillwater, OK?
• What is latitude of the South Pole?

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Longitude

• Longitude lines run through both poles.
• 0 goes through Greenwich, England.
• Negative is west, positive is east.
• What longitude is Stillwater, OK?

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How does GPS work?
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One Satellite locates us on a sphere.
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Two Satellites locates us on a circle.
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Three Satellites locate us at one of two points.
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Four or more satellites gives better accuracy.

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Can be very important to get it accurate!
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