Navigating aid is a term used to describe the tools and instruments used by sailors and navigators to determine their position and direction. The most common navigating aids are a MAP (3 letters), sextant (7 letters), POLESTAR (8 letters) and seamap (6 letters). A MAP is a two-dimensional representation of a geographical area, while a sextant is an instrument used to measure the angle between two visible objects. The POLESTAR is a star used as a navigational reference point, and a seamap is a chart used to plot the course of a ship.