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The sextant measures the angular distance between two vertical or horizontal points. Sailors worldwide use this reflective navigation instrument to determine their position by calculating the angular position of a star on the horizon.
This astronomical navigation technique has been used since the dawn of time by sailors to determine their latitude concerning the sun's inclination or even to calculate the distance of a landmark in coastal navigation conditions. This tool is still used daily by many boaters for its reliability. Although more sophisticated GPS solutions mostly replace it, its presence is still mandatory on board merchant marine vessels. Ancestral but still relevant tool navigators use to locate their position and plot it on maps, thus optimally following their course day and night. Sometimes it isn't easy to learn how to use it. However, this tool must be mastered perfectly by the most informed boaters in the event of an electronic or electrical failure of their modern measuring and navigation instruments.