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Satellites: --
Sun
Moon
ISS
Satellite
Ground track
🛰 Satellites
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📢 FT8 Spots
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⚙ APRS
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🌎 Grey Line Satellite Tracker

Real-time satellite passes, radio spots, and grey-line propagation

🎨 Map Navigation

Drag to pan. Scroll to zoom. Use + controls (bottom-right). Select a Region in the menu to jump to a continent.

◽ Overlays

Night shading — shows the day/night terminator across the globe. Satellite tracks — 80-point ground trails for each tracked satellite. Sun & Moon — markers at the subsolar and sublunar points with moon phase in the status bar (off by default).

📊 Panels

Satellite list — real-time name, altitude, and lat/lon. FT8 Spots — last 10 FT8 DX spots from the cluster. APRS — last 10 APRS station positions. Pass Predictor — search a satellite, click it to compute next 5 passes over the map centre.

Hover any FT8 or APRS row to preview its location on the map.

🏠 Home Location

Click the 🏠 button (bottom-right) to save the current map view as home. Click to snap back. A small orange marker shows your home location.

🎯 Tips

Use the hamburger menu (top-left) to toggle any overlay or panel off/on. The status bar (bottom-left) shows UTC time and moon phase. Legend (bottom-right) explains the map colours. Sun & Moon default to off to prevent screen burn on static displays.