Nautical superstitions are beliefs and practices among sailors that aim to bring good luck or ward off bad fortune at sea. These traditions often stem from centuries of maritime history and experiences. For example, many sailors believe that whistling on a ship can summon strong winds, which could be dangerous during a voyage. Another common superstition involves the presence of cats on board. Sailors often consider black cats to be good luck, while the sighting of a seagull is thought to be a sign of impending danger. These beliefs reflect the deep connection between sailors and the unpredictable nature of the ocean.