An anchor light is a white lamp placed at the very top of a mast. This light must shine in a complete circle to be visible from every direction. Boats use this signal at night to warn others that they are not moving. A captain turns on the anchor light as the sun sets in a busy bay. This bright signal prevents other boats from crashing into the stationary vessel in the dark. Law requires this light to be bright enough to see from two miles away. Many modern lights use solar power to save the main battery for the engine. Keeping this light active all night ensures the safety of everyone sleeping on board.
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