Mac GrayLiner for Mac

Mac Grayliner displays a map of the entire Earth, showing day, night, and more importantly, the terminator between day and night. Studies have shown that enhanced radio propagation occurs between two points which are both on the day/night terminator. Mac Grayliner also displays the status of the NCDXF/IARU beacons. These beacon stations are used to determine current shortwave radio propagation conditions throughout the world.