2.  Dr. Ivan A. Getting introduced idea and GPS system.  Idea introduced by Raytheon Corporation in 1951  1960-1977 Aerospace Corporation develops first GPS constellation consisting of 10 Block I Satellites.  Dr. Ivan A. Getting introduced idea and GPS system.  Between 1989-1994 24 Block II Satellites launched making up today's GPS constellation. Dr. Ivan A. Getting Block II Satellite

3. GPS Receiver measures distance from location to four closest satellites. Four satellites measure relative distance to each other and send radio signal to receiver. Receiver measures time it took to retrieve radio signals, than finds distance to satellites. Receiver calculates distances and finds longitude, latitude, altitude, and speed.

4. ► Range in price from $80 for handheld to over $5,000 for marine and aircraft receivers ► Mapping & Non- mapping receivers ► Accurate from 20 meters for lower end receivers to 1 meter for high end receivers. Mapping Receiver Handheld Receiver Non-mapping Receiver

5. Used by troops for coordination between forces and as main navigational tool. GPS guided cargo packages GPS guided bombs, missiles, and artillery. “Smart bombs” use GPS guidance system and are accurate to within a couple of feet.

6. ► In boating used as a navigational tool. ► Aircraft used also as a navigational tool. ► Automobiles used in accordance with navigational system. ► Hikers use handheld receivers to navigate travel. Car Navigation System Marine GPS

7. GPS Commercial Use ► Used in agriculture. ► LoJack uses GPS to track stolen vehicles. ► Emergency GPS receivers used by hikers, boaters, extreme skiers.

9. THE END