CLIL - Technology: GPS and survival

1. The USA developed GPS||e. for soldiers to use in war.2. Millions of people||a. can now use GPS.3. The system needs to be||f. in contact with satellites in space.4. You must know which way||b. you are moving to survive.5. To track your movement, you should||d. find your position at different points in time.6. Smartphones now have||c. lots of ways to help people survive.