The term 'SEXTANT UPDATED' is a combination of two words. The first word, 'sextant, ' is an instrument used in navigation to measure the angle between two visible objects, such as the horizon and the sun or stars. The second word, 'UPDATED, ' means to make something current or up-to-date. The crossword solution for this term is 'LORAN, ' which stands for Long Range Navigation. LORAN is a system of radio navigation that uses low frequency radio signals transmitted from multiple land-based stations to determine the position of a ship or aircraft. It was developed in the 1940s and was widely used until the introduction of GPS in the 1990s.