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Seamark Technologies: Buoys and Beacons

What are the TWO main functions of a lighthouse tower? 🏠🔦
Difficulty: Easy
🤔 According to the text, which shapes are UNIFORMLY used to describe buoys? 🟢🔶️
Difficulty: Medium
🤯 According to their purpose, what type of light does sectors primarily utilize, and which COLOR is most frequently employed? 🌈
Difficulty: Hard
Space: Our Seamarks By E. Price Edwards 1884

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