Cover of the textbook Into Focus B2

The key answer of exercise 3

The key to exercise solutions in chapter 7 - Language in Focus for the textbook Into Focus B2 with authors Sue Kay, Vaughan Jones, Silvia Minardi, Daniel Brayshaw from Pearson Longman

Question

Choose the correct options and then answer the questions.

Answer

  1. What was the purpose of the original US system that preceded GPS? The original system was built to locate submarines.
  2. What historic decision did US President Reagan make in 1983? He allowed all civilian commercial aircraft to use GPS.
  3. 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).
  4. 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.
  5. 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.

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