Boating hazards are a common concern for those who enjoy spending time on the water. A SANDBANK is an area of shallow water, often found near the shore, where the water is too shallow for boats to pass through safely. An EDDY is a circular current of water that can cause boats to spin out of control. A SANDBAR is a ridge of sand or other sediment that can be submerged and create a hazard for boats. A riptide is a strong, narrow current of water that can pull boats away from shore. A REEF is an underwater formation of rocks or coral that can damage boats if they come into contact with it. A SHOAL is a large area of shallow water that can make navigation difficult. FOG is a weather phenomenon that can reduce visibility and make it difficult to see potential hazards. Renoir is a type of radar system that can help boaters detect potential hazards in foggy conditions. A SNAG is a submerged tree or other object that can damage boats if they come into contact with it.