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