Introduction to Navigation

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Across
  1. 2. Divides the Earth in to top and bottom halves
  2. 6. Starting or reference place for numbering meridians of longitude
  3. 8. Southern Axis
  4. 10. Depicts navigable water areas
  5. 11. Direction of an object from an observer
  6. 12. Top half of the globe
  7. 13. Bottom half of the globe
  8. 14. Imaginary lines formed by passing planes through the Earth parallel to and north and south of the plane of the equator
  9. 18. Rose Circle with 360 degrees of graduations for bearings
  10. 20. Difference between magnetic north and true north
  11. 21. Measurement of speed of a vessel
  12. 24. Terrestrial Sphere
  13. 25. Depicts land areas
  14. 26. International Date Line
  15. 27. Device for measuring speed of a vessel
Down
  1. 1. Direction of an object based on true north
  2. 3. Direction a vessel is facing
  3. 4. Northern Axis
  4. 5. Imaginary lines formed by intersection of planes passing through the poles
  5. 7. Western half of the globe
  6. 9. compass error caused by nearby iron
  7. 15. Bearing
  8. 16. Eastern half of the globe
  9. 17. Direction of an object measured from a vessel's bow
  10. 19. Direction a vessel is steered through the water
  11. 22. Any circle whose plane passes through the Earth's center
  12. 23. Location of the prime meridian