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GPS by Mind Map: GPS

1. Use of the GPS

1.1. civil

1.1.1. time service

1.1.2. social networking

1.1.3. navigation

1.2. commercial

1.2.1. measurement

1.3. military

2. History

2.1. Transit

2.2. Timation

3. disadvantages

3.1. error souces

3.2. not cheap enough for everyone

4. How it works

4.1. Function

5. advantages

5.1. identify the route

5.2. be applied in urgent situation