Loxodrome Meaning in Sailing

A loxodrome (also known as a ‘rhumb line’) represents a path that crosses all meridians of longitude at the same angle. On a standard flat nautical chart (Mercator projection), a loxodrome appears as a straight line, making it very easy for a sailor to steer a constant compass heading. However, over long distances, a loxodrome is not the shortest path; that would be a ‘Great Circle’ route. One specific example involves a navigator drawing a straight line on a chart between two islands and following that compass bearing for the entire trip. While less efficient than a great circle for ocean crossings, loxodromes are the standard for most coastal and short-distance navigation because they are simple to follow. It is the practical ‘straight line’ of the maritime world.