GPS IIF-1 over St. Louis tonight
Pass predictions for St. Louis, MO.
Next visible pass
Thu, Sep 10, 2:42 AM
Peak elevation 41.31° · rises NW · sets SW
Tracking: GPS BIIF-1 (PRN 25) (NORAD 36585)
7-day pass forecast
| Date | Time | Peak elev | Rises | Sets |
|---|---|---|---|---|
| Sep 10 | 2:42 AM | 41.31° | NW | SW |
| Sep 10 | 11:42 AM | 33.81° | SE | NE |
| Sep 11 | 2:38 AM | 41.32° | NW | SW |
| Sep 11 | 11:38 AM | 33.81° | SE | NE |
| Sep 12 | 2:34 AM | 41.32° | NW | SW |
| Sep 12 | 11:34 AM | 33.81° | SE | NE |
| Sep 13 | 2:30 AM | 41.33° | NW | SW |
How to spot GPS IIF-1 from St. Louis
GPS navigation satellite in MEO at ~20,200 km — visible with binoculars in the right window.
- Look in the direction listed — passes start near the horizon and arc across the sky.
- Peak elevation matters — a 60°+ peak means it'll go nearly overhead; under 30° stays low.
- Best viewing is in the 90 minutes after sunset or before sunrise — the satellite is sunlit while you're in shadow.
- No equipment needed for bright passes — the ISS at peak rivals Venus.
Going to look up?
For fainter satellites you'll want 7×50 or 10×50 binoculars. A pair of Celestron SkyMaster binoculars is the consensus pick. Affiliate placement — replace with your affiliate link.
Pass alerts on your phone
Browser push, no email needed. We'll notify you 30 minutes before GPS IIF-1 is visible from St. Louis.
Prefer email?
One email tonight before GPS IIF-1 is visible, never more than 2/week.