CT1BOH — Interactive DX Atlas

Geographical overlays Country borders / land Latitude / longitude graticule Maidenhead fields (20° × 10°) Maidenhead field labels Reference cities DXCC entity prefixes

DXCC data loads when enabled (AD1C CTY.DAT).

If browser blocks the download, load a CTY.DAT file:

Geomagnetic overlays Magnetic latitude contours Magnetic equator Dipole magnetic polesContour spacing

Approximate centred-dipole magnetic coordinates (north dipole pole ≈ 80.65°N, 72.68°W). Not AACGM; not a real-time auroral boundary.

Space weather overlays Show aurora forecast (NOAA OVATION)

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Aurora intensity: ■ low ■ moderate ■ high ■ very high

D-layer contours Show D-layer electron density (NeD) Show D-layer absorption (NOAA DRAP)Absorption frequency

DRAP data not loaded.

NeD: illustrative solar-zenith empirical model (not calibrated electron-density observations). DRAP: NOAA SWPC absorption grid, where available; contours in dB.

Solar & navigation Day/night terminator Sun position

Country geometry: Natural Earth via world-atlas CDN. DXCC entities and CQ/ITU zone polygons require separate authoritative radio datasets and are not represented by ordinary political borders.

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CT1BOH — Interactive DX Atlas

Map projectionProjection

LatitudeLongitude

Center grid

Enter a grid (e.g. IM58) and press Enter. The entered grid stays displayed until you replace it.

Azimuthal radius

Left click: move map
Right click: measure distance & azimuth

Move pointer to inspect coordinates and bearing.

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