GPS geocaching presentation 2006 during english course at Campus FH-Wels.at answers you quickly the following questions: how does GPS work? / what is geocaching?

1. GPS
• history
• functionality
• accuracy
geocaching
• ?
• equipment
• conclusion
the journey

2. 1973 U.S. Air Force & Navy decided to develop a
satellite navigation system.
1974/79 System tests: Pseudolites and 11 Block I satellites
1979 Decision to expand the GPS system to 24 satellites.
1983 When a civilian airplane (Korean Airline) was shot
down after it had gone lost over Soviet
territory, it was decided to allow the civilian use of the GPS
1989/94 replacement with improved Block II satellites
1995 Full Operational Capability (FOC) is announced.
2000 deactivation of the selective availability and
therefore improvement of the accuracy for civilians
2005 Launch of the first 2R-M GPS-satellite.
January 2006: 28 satellites (oldest one Feb. 1989)
GPS - history

3. atomic clock
2R-M assembly
Lockheed Martin

4. 26.560 km from centre of earth
- 6.360 km earth radius
________
20.200 km pathway-height
MEO - "medium earth orbit"
GPS - functionality
true to scale
Monitor Stations - Hawaii

5. GPS - functionality
Position Determination
I am satellite X, my
position is Y and this
information was sent
at time Z.
distance

6. GPS - functionality
clock difference
• Signals travel with the speed of light:
c = 299 792 458,0 m/s
• Time span between the satellite and the
receiver lies in the range of 0.07 sec.
• A clock error of 1/100 second would lead to
a mistake in the position of about?
3000 km ! 2997924.58 m ;-)
• To achieve an accuracy of 10 m of the
position, the runtime of the signal must be
precise to 0.00000003 seconds …

7. 1983
GPS - accuracy
2000 Galileo…2007
100
[m]
[year]
5
2
0.01
US Army …
SA
(Selective Availability)
SA
WAAS / EGNOS
DGPS
(Differential GPS)

8. geocaching - ?

9. geocaching - ?
spoiler! :-/

10. geocaching - ?
Implosion Meteor
solarthermienator
-
cachenote

11. geocaching - ?
cache content
• Log-book
• Pencil
• Cachenote
• Trade stuff
• Deed of FTF

12. ….
geocaching.com
Log our visit!

13. geocaching - equipment
=> GPSr
• Compass
• Map
• Cache Bag
• PDA
• Location
• Stuff to Stash (trade)
• Container (waterproof)
• Micro-caches
• Hiking Staff
• special equipment like:
scuba gear, things for climbing …

14. geocaching - conclusion
• Find places you’ve never been
or recognised before.
• Do outdoor sports with a
mission in background.
• Enjoy the beautiful nature ...
... and protect her!

15. chief source of information
Global Positioning System:
http://en.wikipedia.org/wiki/Global_Positioning_System
http://www.kowoma.de/en/gps/index.htm
Pictures and Art:
http://www.deviantart.com/
http://www.lockheedmartin.com/GPS/
Geocaching:
http://www.geocacher-u.com/
http://www.geocache.at/
http://www.geocaching.com/