An example of a Great Circle Map that is centered on the city of Madrid, Spain:

The Azimuthal Equidistant map, produced by EI8IC's 'Great Circle Mapper' program, includes non-overlapping Amateur Radio prefixes, and can be used to determine the correct direction to point a beam antennna that is located in Madrid, Spain. You can use this map on your own website if you include a link back to this site, and do not edit the map in any way.