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Esoteric Beacons of Maritime Sentinels
Challenging puzzle for experienced crossword solvers
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Across
  • 1. Instrument measuring distance to shore signals used in navigation (11)
  • 3. Innovative lens divides light, named after Augustin-Jean (7)
  • 5. Mirage effect distorting lighthouse sightings offshore (7)
Down
  • 2. Combining reflection and refraction, key to lighthouse optics (10)
  • 4. Traditional protective mesh for delicate coastal apparatus (10)
  • 6. Glass enclosures crowning towers, guiding ships at night (8)

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