Key buoy, Safe water mark buoy in North Sea, Germany
The key buoy is a safe water mark in the North Sea, painted with vertical red and white stripes and topped with a red spherical topmark. It signals that the surrounding waters are free of hazards and that vessels can pass on either side.
Marks of this type were gradually introduced in the North Sea to guide growing ship traffic along the German coast toward safe passages. The current system of standardized markings was established in the 20th century through international agreements.
The red and white striped buoy is an instantly recognizable signal in the German maritime system, telling sailors they can move freely in any direction. It serves as a reliable reference point when approaching a harbor entrance.
The buoy is visible from a good distance at sea, and at night a white flashing light helps confirm its position. Sailors should always carry up-to-date charts, as the exact positions of buoys in the area can change over time.
Unlike most other buoy types, a safe water mark can be passed on either side, which gives it a different role from the buoys that must be left to port or starboard. This makes it one of the few marks at sea that does not prescribe a specific route.
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