Mercator sailing is a type of navigation that uses a cylindrical map to plot a course. Similar terms for Mercator sailing include rhumb line navigation, loxodromic navigation, and chart sailing. The rhumb line is the path a ship would take when sailing the same course on a Mercator map. This type of navigation is commonly used for marine and aviation purposes, as it allows for a constant bearing to be maintained between two points. Loxodromic navigation refers to the constant course and increasing distance travelled while following a rhumb line. Chart sailing simply refers to the act of plotting a course using a navigational chart, which may incorporate Mercator projections and rhumb lines.