Marching lines are a pair of lines drawn on the glass of a compass, and arranged at 45 degrees to each other. These are an essential component in hiking through the wilderness. Most modern compasses have adjustable luminous marching lines. History See also Azimuth Beam compass Circumferentor, or surveyor's compass Coordinate system Fluxgate compass Gyrocompass Inertial navigation system Pelorus Radio direction finder References External links Navigational equipment Hiking equipment Orientation (geometry)