Lorans are gone now but they had been around long before GPS. Many hangs, fish and diving spots are in Loran TD coordinates. This menu that is provided by WindPlot will transform the TD's into Latitude/Longitude and then store it into the mark list. At the same time you can assign it a color and shape. WindPlot also can provide an excelent automatic compensation (ASF) option to make the old Loran hangs work with you GPS readings.