GPS: Global Positioning System

1. GPS:Global Positioning System Wildlife Management 20/30

2. The History of GPS • Feasibility studies begun in 1960’s. • Pentagon appropriates funding in 1973. • First satellite launched in 1978. • System declared fully operational in April, 1995.

3. The Global Positioning System is a constellation of 31 satellites that is used to calculate your position. How do you use these satellites to calculate your position?

4. Three Segments of the GPS Space Segment User Segment Control Segment GroundAntennas Monitor Stations Master Station

5. Control Segment Master Control Station Monitor Station Ground Antenna US Space Command Cape Canaveral Hawaii Kwajalein Atoll Diego Garcia Ascension Is.

6. Three Segments of the GPS Space Segment User Segment Control Segment GroundAntennas Monitor Stations Master Station

7. Space Segment

8. Three Segments of the GPS Space Segment User Segment Control Segment GroundAntennas Monitor Stations Master Station

9. User Segment • 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. Position is Based on Time Signal leaves satellite at time “T” T Signal is picked up by the receiver at time “T + 3” T + 3 Distance between satellite and receiver = “3 times the speed of light”

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

12. 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.

13. Getting Started… • 5 buttons: • Power • Page (also the “back” function) • Enter • Up • Down

14. Getting Started… • Power the GPS on: Hold the Power Button • It will prompt you if you are indoors, select: YES by pressing the up/down and enter keys. • Keep selecting the “Page” button until you get to the MENU screen. You know you’re there when the following options are shown: • Mark • Waypoints • Routes • Tracks • Setup

15. Getting Started… • Scroll down to Mark, and select it with the Enter key. • It will prompt you to Mark Waypoint, before you select YES with the Enter key, use the UP arrow to the Number: 001 Change this to the title school. Once that is titled, scroll down to highlight the OK and select it with your Enter key. • Write down the Elevation: • Write down your bearing: • N__*__.___` • W___*__.___`

16. Marking Way Points • You and a partner are going to mark Way Points. • Head to the M and mark the Way Point as M. • Head to the closet field goal post on the football field and mark the Way Point as Post. • Head to the water tower and mark the Way Point as Blue. • **It is critical that you label your Way Points!!!**