A visible landmark or beacon used for navigation during daylight, especially a marker visible from the sea.
Compound of 'day' + 'mark,' nautical term distinguishing markers visible in daylight from nighttime navigational aids like lights.
Sailors have used daymarks for millennia—distinctive tower paintings or structures visible from miles away—and modern ship captains still rely on them more than we'd expect, especially in coastal waters where GPS can be unreliable.
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