Compass and Marine Compass for your nautical home and office. A compass (or mariner's compass) is a navigational instrument for pointing out directions by using points of North, South, East and West. A magnetized pointer aligns itself accurately with Earth's magnetic field, which assists in navigating. A compass can be used with a chronometer (which helps determine longitude by using a fixed location) and a sextant (used to measure the angle of the sun to provide latitude) to provide a very accurate navigation capability. The compass improved maritime trade, making it more feasible. You will always know which direction you are heading with these exotic brass compasses. Affordably priced, they make an excellent gift for yfavorite sailor.