G55

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Across
  1. 3. Recorded travel path
  2. 5. Earth shape model
  3. 8. Star-based navigation
  4. 9. Pixel-based GIS data
  5. 11. Known elevation point
  6. 15. Line-based GIS data
  7. 16. Navigation reference point
  8. 17. Distance-based positioning
  9. 18. Gravity-based Earth model
  10. 19. Coordinate reference base
  11. 20. Measurement by triangles
Down
  1. 1. Direction of travel
  2. 2. East-west map line
  3. 4. Angle-measuring tool
  4. 6. Land measurement
  5. 7. GIS data level
  6. 10. Position estimation
  7. 12. Precise timekeeper
  8. 13. Planned travel path
  9. 14. Intended direction