Real-time orbital tracking & visibility / radio-range forecasting
Observer Location
Detected:detecting…
Current Time
Your Local Time
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UTC / Zulu
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Current ISS Status
Latitude
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Longitude
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Altitude
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Velocity
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Distance from You
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Ground Track (Current Orbit)
ISS current positionGround track (this orbit, ±45 min)Your locationRadio horizon (visibility circle)
Grid shows latitude/longitude lines only (a schematic nav-grid, not a literal landmass map) — read position by the labeled degree lines.
Next Visible Pass — Countdown
(from your location — scroll up to check/edit it if it's not right)
Enters Visual/Radio Range In
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Peak (Overhead) In
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Upcoming Passes (Next 5 Days)
Date
Rise
Max Elev.
Set
Duration
Visibility Quality
Visibility Quality is based on the pass's max elevation above your horizon: Excellent (40°+), Good (20–39°), Fair (10–19°), Low/marginal (below 10°) — higher elevation means a clearer view and stronger signal path, away from trees/buildings near the horizon.
Selected Pass — Polar Plot (Az / El)
Select a pass above to see its sky path.
ISS path across the skyRise pointSet pointCenter = zenith (directly overhead) · Edge = horizon
Live Doppler Tuning Assistant
Downlink:
Nominal Frequency
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Doppler-Corrected RX Now
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Shift
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Waiting for pass data…
Doppler shift is computed live from the actual range-rate between the ISS and your location (SGP4 state vectors), not a fixed estimate. Tune slightly above nominal on approach, at nominal near closest approach, and below nominal as it recedes.
Best Opportunity Score (Pass Geometry × Space Weather)
Loading live solar/geomagnetic conditions…
Date
Max Elev.
Geomag. State
Combined Score
Recommendation
Fuses this tool's pass geometry with live NOAA solar flux (SFI) and planetary K-index — the same feeds used in the HF Band & Sunspot Forecaster. Being transparent about the physics: geomagnetic/solar activity mainly governs HF (shortwave) skip, not VHF/UHF line-of-sight ISS contacts. Score weights pass elevation ~85% / space-weather ~15%, and the K-index note is included mainly because a quiet, low-K-index day also tends to mean lower VHF noise floor and calmer conditions generally — it is a minor secondary signal, not a strong predictor, and is labeled as such rather than overstated.