What is the general purpose of buoys in navigation?

The purpose of buoys in navigation is primarily to serve as aids to navigation. They are strategically placed in navigable waters to mark specific features such as channels, shoals, and obstructions, providing vital information to mariners to help them safely navigate. These buoys can indicate the safest route for vessels to follow, warn of hazards, and assist in positioning the vessel accurately.

While buoys may sometimes be associated with fishing or signals related to distress or weather, their main function remains focused on enhancing navigation safety by guiding vessels through potentially hazardous waters and ensuring they avoid underwater obstructions. Thus, the correct answer highlights the essential role that buoys play in maritime navigation.