A system of buoys used to mark navigation channels, hazards, or safe passages in water for ships and boats.
From buoy + -age (a noun-forming suffix indicating a system or collection). 'Buoy' comes from Dutch boei or French boue. The suffix '-age' creates a collective noun describing the overall system of buoys.
Modern buoyage systems use surprisingly sophisticated color codes and light patterns—the International Association of Marine Aids to Navigation created standardized rules so a captain from Japan could read an American buoy's meaning instantly.
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