7 - Language in Focus
Exercise
3
Choose the correct options and then answer the questions.
Solution
- What was the purpose of the original US system that preceded GPS? The original system was built to locate submarines.
- What historic decision did US President Reagan make in 1983? He allowed all civilian commercial aircraft to use GPS.
- Currently how many systems are there and who do they belong to? There are four systems: GPS (US), GLONASS (Russia), Galileo (EU), and BeiDou (China).
- How would your location be affected if only three satellites were in sight? Your location wouldn't be calculated accurately without a fourth satellite to account for Einstein's theory of relativity.
- How can GPS contribute to environmental advice? GPS can help by gathering data on soil, weather, and environmental changes such as melting ice caps, advancing deserts, and predicting natural disasters.