Marine navigation devices are tools used by sailors and boaters to determine their position and navigate safely on water. Common devices include GPS (Global Positioning System), which provides precise location data, and compasses, which help in understanding direction. Other tools like charts and radar systems assist in plotting courses and detecting nearby objects. These devices enhance safety and efficiency during maritime travel. Sonar technology is also used to measure water depth and locate underwater obstacles. Overall, marine navigation devices are essential for ensuring safe and effective navigation on the seas and oceans.