Marine devices are tools and equipment designed for use in or on water. They include a variety of items such as buoys, navigational instruments, and fishing gear. These devices help with navigation, safety, and recreational activities on oceans, rivers, and lakes. Many marine devices are engineered to withstand harsh conditions, including saltwater corrosion and extreme weather. Examples include GPS systems for tracking locations, sonar for detecting underwater objects, and life jackets for safety. These devices play a crucial role in ensuring safe and efficient operations in marine environments.