GPS IIF-1 over St. Louis tonight
Pass predictions for St. Louis, MO.
Next visible pass
Wed, Jun 10, 12:23 PM
Peak elevation 23.61° · rises SW · sets SW
Tracking: GPS BIIF-1 (PRN 25) (NORAD 36585)
7-day pass forecast
| Date | Time | Peak elev | Rises | Sets |
|---|---|---|---|---|
| Jun 10 | 12:23 PM | 23.61° | SW | SW |
| Jun 10 | 5:59 PM | 34.08° | SE | NE |
| Jun 11 | 8:56 AM | 41.01° | NW | SW |
| Jun 11 | 5:55 PM | 34.09° | SE | NE |
| Jun 12 | 8:52 AM | 41.01° | NW | SW |
| Jun 12 | 5:51 PM | 34.09° | SE | NE |
| Jun 13 | 8:48 AM | 41.01° | 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.