Lighthouse crossword

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Across
  1. 1. The tall structure of a navigational guide.
  2. 4. The process of planning and following a route.
  3. 6. A signal fire or light to guide or warn.
  4. 8. A piece of glass that focuses light in a navigational aid.
  5. 10. The light source within a navigational beacon.
Down
  1. 2. A surface that throws back light without absorbing it.
  2. 3. A device producing a loud sound to warn ships in poor visibility.
  3. 5. A person responsible for maintaining a navigational light.
  4. 7. Relating to the land bordering the sea.
  5. 9. A ray of light emitted from a navigational structure.