Worldwide MQTT subscription · 324 Maidenhead fields · map starts at IM (coverage depends on broker wildcard support)
Band activity: 0>0–20%>20–40%>40–60%>60–80%>80–100%· relative to busiest band (filtered count when selected)
Lines connect the approximate centres of the TX and RX Maidenhead locators. Click a line or marker for spot information. Grid-centre locations are approximate, not station antenna coordinates.
Click a cell to inspect matching spots. Counts are reports, not unique QSOs. Only active grids in the selected field are shown.
Propagation activity and view selection
ALL0
Geographical selection
Worldwide propagation
Band
10m15m20m40m
Live propagation map — IM
Centered view:
Map settings
ConnectionStarting…
Spots in window0
Active grids0
Signal mode & minimum SNR
DIRECTION
SIGNAL
MIN SNR
NeD contours: same solar-zenith model and contour levels (50–1500) as CT1BOH DX Atlas. Illustrative model values, not calibrated electron-density measurements.
Each active directed two-field path with at least 3 spots (for example, IM → FN) receives at least one line when the number of paths does not exceed the selected limit. Remaining lines are distributed in proportion to the number of spot reports per path, without exceeding the number of reports available. Opposite directions count as different paths. If more paths are active than the selected limit, the most active paths take priority. The selected time window determines which spots are eligible; matrix and rankings follow the selected field filter, or show worldwide activity in ALL mode.
10 metres
15 metres
20 metres
40 metres
ALL · ALL
0 spots
ALL · ALL
0 spots
Corridor classification
Observed —Active, not observed —Insufficient TX —
Counts are unordered grid pairs. Observed requires ≥3 reports in either direction; active requires qualifying TX activity at both endpoints.
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Inactive pathsInsufficient TX activity
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Active, not observedGrid has TX activity elsewhere
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Observed pathSolid red = TX; hollow = RX
Observed directional paths require ≥3 spot reports in the same direction.
Azimuthal equidistant view starts at an 8,000 km radius (maximum 20,000 km). Use + / − to change the radius in 2,000 km steps; ↺ resets zoom to 8,000 km. Drag with your mouse or finger to rotate the Earth and change the map centre. Double-click to return to 90°N, 138°E. The flat basemap is used in this projection.
324 Maidenhead Fields - click on a grid
Number of spot reports per Maidenhead field (TX + RX).
■ Below −15 dB (below CW)■ −15 to <+6 dB (CW equivalent)■ ≥ +6 dB (SSB equivalent)
Click a field to filter the map and matrix. Click it again to show all fields.
Rows: latitude A–R (north at top). Columns: longitude A–R (west to east). Each spot counts once in its TX field and once in its RX field; if both ends share a field, it counts twice. In ALL mode, counts include worldwide received reports. With a field selected, counts include only spots involving that field.