You ..1.. probably never heard of NavStar, but you may have heard ..2.. the initials GPS. These two names are abbreviations.

1. could have may can

2. of that in or

NavStar is the short form of the ..3.. clumsy words Navigation System using Time And Ranging, and GPS ..4.. for Global Positioning System.

3. bit other rather just

4. works places stands holds

And they mean that in the ..5.. future, you will never get lost again.

5. close near coming soon

NavStar is in ..6.. eighteen satellites which orbit the earth at an altitude of over 20 000 km.

6. real deed actual fact

These satellites go around the world on different orbits, so that at ..7.. two of them are in the sky over every part of the Earth.

7. least minimum fewest last

This means that NavStar is somewhere overhead ..8.. you are reading this.

8. as during for now

They are the most important ..9.. of the whole system, which is called GPS.

9. bite area sort part

GPS as a ..10.. includes computers on the ground which calculate the time that it takes for the radio signals from NavStar to reach them. ..11.. this information, they can tell the people using the computers where they are.

10. idea whole fact entity

11. After Because Using Thanks

During the Gulf war, which was ..12.. in huge open spaces in the desert, GPS helped the allied armies to get to their targets faster than their enemies believed possible.

12. done fought battle happened

Today GPS is ..13.. by all sorts of businesses.

13. using benefit good used

Vehicles ..14.. with GPS allow their bases to know where they are at every minute of the day. GPS also works with map programmes on computers.

14. carried loaded fitted worked

Already some motorists use GPS to drive confidently to places they have never ..15.. to before.

15. been visited went come

Never get lost again!

You may probably never heard of NavStar, but you may have heard of the initials GPS. These two names are abbreviations. NavStar is the short form of the rather clumsy words Navigation System using Time And Ranging, and GPS stands for Global Positioning System. And they mean that in the ..5.. future, you will never get lost again.

NavStar is in fact eighteen satellites which orbit the earth at an altitude of over 20 000 km. These satellites go around the world on different orbits, so that at least two of them are in the sky over every part of the Earth. This means that NavStar is somewhere overhead as you are reading this. These satellites transmit a radio signal. They are the most important part of the whole system, which is called GPS.

GPS as a whole includes computers on the ground which calculate the time that it takes for the radio signals from NavStar to reach them. Using this information, they can tell the people using the computers where they are. During the Gulf war, which was fought in huge open spaces in the desert, GPS helped the allied armies to get to their targets faster than their enemies believed possible.

Today GPS is used by all sorts of businesses. Vehicles fitted with GPS allow their bases to know where they are at every minute of the day. GPS also works with map programmes on computers. Already some motorists use GPS to drive confidently to places they have never been to before.