Ключевые слова: attention, black, blue, border, buoy, canal, channel, color, conical, danger, equipment, fairway, float, foothold, harbor, lake, liquid, mark, nautical, navigate, navigation, navigational, red, ripple, river, safety, salvation, sea, security, shipping, sign, solution, sphere, still, striped, surface, transportation, warning, warning sign, warning symbol, water, yellow,