1. Global Positioning System (GPS) WHAT: Describe GPS and how it is used HOW: Group discussion and an activity to find a secret location WHY: GPS technology has become widespread in our daily lives

2. Global Positioning System It provides location and time information in all weather conditions, anywhere on Earth where there is an unobstructed line of sight to four or more GPS satellites. The system provides critical capabilities to military, civil and commercial users. It is maintained by the United States government and is freely accessible to anyone with a GPS receiver. GPS gives you an accurate location of where you are by receiving signals from a network of satellites

3. Finding your location You can establish your location based on the known distances from a number of transmitter stations In two dimensions this process is known as triangulation A more complex (3D) process of trilateration is used by GPS – based on four spheres Transmitter A Transmitter B Transmitter C

4. Group Activity Can you find the secret location - using the activity sheets and materials provided

5. Worksheet - Applications SATNAV: In car satellite navigation systems Lorry Fleets: Used to track and locate vehicles Military - its original purpose, to help soldiers in the field Shipping - to navigate the seas Farming - to track crop growth and fertilizer application Leisure - Mountaineers, hikers, explorers, geocaching Crime - offenders can now be 'tagged' with a GPS Task : Complete worksheet and review answers GPS Devices – Common Applications

6. Geocaching Geocaching is an outdoor, high-tech treasure hunt. Players try to locate hidden containers, called geocaches, using GPS enabled devices and then share their experiences online