Why Use Maps???

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Why Use Maps???
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Closer Look at Bethlehem, PA Area Map
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Latitude and Longitude
1. What is latitude? 2. What is longitude?
Latitude are lines that run parallel to the
equator.
Longitude are lines that run perpendicular to the
equator.
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Longitude and latitude and positive and negative
numbers.
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negative
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negative
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Location
How can we find the location of any place on the
map?
By using the coordinates - latitude and longitude
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Location
What are the coordinates for Broughal Middle
School?
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Location
How can we get the coordinates for any
location? What technology can we use?
A GPS
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GPS
Global Positioning System (GPS) is currently the
only fully functional Global Navigation Satellite
System (GNSS).
Transmit signals that indicate positioning. Used
for navigation, map-making, and land
surveying. Also provides time reference
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Global Positioning System (GPS)
A constellation of 27 Earth-orbiting satellites
(24 in operation and three extras in case one
fails). Developed and implemented this
satellite network by U.S. Military
NAVSTAR GPS satellite
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In order for a GPS device to find a location,
there needs to be three satellites to pin-point
the spot. The combination of the three
satellites working together is called
triangulation.
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Global Positioning System (GPS)

• Circles the globe at about 12,000 miles (19,300
  km)
• 2 complete rotations every day
• At least four satellites "visible" in the sky.

Find location through a mathematical principle
called trilateration.