AS BRASS TAMAYA Nautical Sextant Black Vintage Navigation Solid Brass & Aluminium Sextant... *The Tamaya Nautical Sextant is a precision instrument used in navigation to measure the angle between two visible objects, typically the horizon and a celestial body such as the sun, moon, or stars. It is named after its manufacturer, Tamaya of Japan, which has been producing nautical instruments since 1923. *The Tamaya Nautical Sextant is made of high-quality materials such as brass,and features a precision sighting system with an adjustable telescope and vernier scale for accurate measurements. It also has a built-in magnifying lens for enhanced visibility, and a bubble level to ensure that the sextant is held level during use. *The instrument is designed to be used by trained navigators, and is used to determine a ship's position at sea by measuring the angle between the horizon and a celestial body, and comparing it to the known position of that celestial body in the sky at a given time. This information can then be used to calculate the ship's latitude and longitude. *The Tamaya Nautical Sextant is widely regarded as one of the highest quality sextants available, and is favored by professional navigators, sailors, and maritime enthusiasts for its precision, durability, and reliability.