The instrument often used by sailors for navigation is the sextant. This tool helps mariners determine their latitude and longitude by measuring the angle between a celestial object, such as the sun or stars, and the horizon. By using the sextant in conjunction with celestial navigation tables, sailors can plot their position accurately at sea, which is crucial for safe and efficient passage across oceans. Although modern technology, like GPS, has largely replaced sextants, they remain an essential part of maritime tradition and training. Many navigators still learn how to use a sextant as a valuable skill.