Live Gray-Line Map. The "gray line" is a band around the Earth that separates daylight from darkness. Propagation along the gray line is very efficient. Ham radio operators and shortwave listeners can optimize long distance communications to various areas of the world by monitoring this band as it moves around the globe. This plugin also comes with UTC+ Local Clock and your Sunset and Sunrise for your geographic position. New feature! You can now click with the mouse on the map to set the Rotator azimuth in relation to you own coordinates.