What is GPS?

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Across
  1. 3. GPS satellites orbit Earth in a pattern
  2. 4. user errors
  3. 5. any object that orbits another object in space
  4. 7. position east or west of the prime meridian
  5. 8. shape of Sputnik 1
  6. 9. how high something is above sea level
  7. 10. number of GPS satellites necessary to get a good position
Down
  1. 1. position north or south of the equator
  2. 2. used long ago to travel
  3. 6. times GPS satellites orbit Earth per day
  4. 8. powers satellites