Puzzle 1

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Across
  1. 2. A popular navigation instrument used in maritime travel during the past few centuries
  2. 3. Surveying instrument used in the oceans
  3. 6. An equipment essential for many types of levelling
  4. 7. An all in one surveying instrument
Down
  1. 1. Produces 3D images
  2. 4. Technique used by GPS satellites to determine the location
  3. 5. A computer aided software that links geographic information with descriptive information
  4. 8. A surveying instrument that can only measure angles