• Start by selecting an active part of the map corresponding to your location (adjust and confirm your selection). This will show areas open for communication from that perspective. The grid square of this location is displayed with a cancel button; cancelling returns the display to the world-wide view.
• Upon load, the map starts automatically cycling through the active band.
• Bands that are not of interest may be skipped by removing the associated "view" checkbox.
• Selecting a band number will stop the cycling and switch to that band.
• Use the ⏯ button to resume scrolling through the bands.
• Moving the pointer over active areas of the maps will reveal the band and SNR level, indicating whether the band supports SSB, CW, or digital communication.
• The map automatically updates itself about every minute. (There is no need to manually refresh.)

This map shows real-time radio propagation from stations operating on 11 bands between 1.8 and 54 MHz in the amateur radio service. The display shows worldwide activity from the last 15 minutes and is automatically updated about every minute. JavaScript must be enabled to use see the real-time graphics.

Maximum usable frequence (MUF) is the highest frequency that supports communication between two points. On this map, MUF can be considered the maximum used frequency, since the display is based on real-time data.

Data for the map is gathered from several online sources: WSPRnet, Reverse Beacon Network (CW, FT4, FT8), and DX Cluster. Some of these sources provide signal-to-noise ratio (SNR) information.

SNR can be used to determine if a particular path supports certain modes like morse code (CW) or single sideband (SSB).

The map indicates SNR levels with three different per-band shades: SSB (SNR > 10), CW (SNR > -1), or digital modes (which can decode down to an SNR of about -28).

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