1. Presenter- Dan Carey dcarey90@gmail.com https://careywiki.wikispaces.com/ August 11 and 12, 2009

2. Today’s Goals Learn what is GPS How to work with a GPS unit Initialize it, collect data, enter data, clear data How it is used in the real world Why it is important in education Hands on practice

3. History of GPS G lobal P ositioning S ystem Began in the 1970’s for military purposes Fully operational April 1995.

4. How a GPS works Three components to Global Positioning Systems Space segment User segment – you holding the GPS unit Control segment

5. Space Segment Consists of 24 to 32 satellites that orbit earth that are sending precise radio signals to the GPS receiver Artist Interpretation of GPS satellite, image courtesy of NASA Source: http://www.navcen.uscg.gov/ftp/gps/ggeninfo/gps-iif.tifhttp://www.navcen.uscg.gov/ftp/gps/ggeninfo/gps-iif.tif

6. User Segment Consists of a GPS receiver Can be a handheld unit In your automobile Farm equipment Cell phone A GPS receiver calculates its position by precisely timing the signals sent by the GPS satellites high above the Earth

7. Control Segment The flight paths of the satellites are tracked by US Air Force monitoring stations The tracking information is sent to the Air Force Space Command's master control station in Colorado Springs. Then contacts each GPS satellite regularly with a navigational update.

8. Control Segment Space Segment User Segment Putting it all together Monitor Stations Ground Antennas Master Station

9. How a GPS can be used  Military.  Search and rescue.  Disaster relief.  Surveying.  Marine, aeronautical and terrestrial navigation.  Remote controlled vehicle and robot guidance.  Satellite positioning and tracking.  Shipping.  Geographic Information Systems (GIS).  Recreation.

10. Sources of Signal Interference Earth’s Atmosphere Solid Structures Metal Electro-magnetic Fields

11. Waypoint  A waypoint is based on coordinates entered into a GPS receiver’s memory.  It can be either a saved position fix, or user entered coordinates.  It can be created for any remote point on earth.  It must have a receiver designated code or number, or a user supplied name.  Once entered and saved, a waypoint remains unchanged in the receiver’s memory until edited or deleted.

12. Planning a Navigation Route Start = Waypoint

13. How A Receiver Sees Your Route