Our spots map is a zoomable Great Circle map centered on your QTH. WSPR only uses the first part of your locator so your exact QTH could be some tens of kilometres from your actual location. The map shows the location of stations that have received your signal over the selected period. The colours relate to signal levels. You can "mouse-over" the spots to see additional data.
In addition to more time-ranges, Premium users can compare the spots from their station with another station. In the case the colours of the spots show which station has been received. This feature is useful for testing beam antennas.