A Nautical TAMAYA SEXTANT MEASURE 9" X 9" X 4.5" & MADE OF SOLID ALUMINIUM.A TAMAYA NAUTICAL sextant is a doubly reflecting navigation instrument that measures the angular distance between two visible objects. The primary use of a sextant is to measure the angle between an astronomical object and the horizon for the purposes of celestial navigation. This is A Good Gift Option For Mariners and surveyors, navigational or nautical enthusiast, and your Friends and Family having keen interest in Navigating.