GPS IIF-1 over Boston tonight
Pass predictions for Boston, MA.
Next visible pass
Wed, Sep 9, 4:10 PM
Peak elevation 28.47° · rises NE · sets NE
Tracking: GPS BIIF-1 (PRN 25) (NORAD 36585)
7-day pass forecast
| Date | Time | Peak elev | Rises | Sets |
|---|---|---|---|---|
| Sep 9 | 4:10 PM | 28.47° | NE | NE |
| Sep 10 | 4:00 AM | 25.95° | NW | W |
| Sep 10 | 12:21 PM | 51.61° | SE | NE |
| Sep 11 | 3:56 AM | 25.96° | NW | W |
| Sep 11 | 12:17 PM | 51.61° | SE | NE |
| Sep 12 | 3:52 AM | 25.96° | NW | W |
| Sep 12 | 12:13 PM | 51.61° | SE | NE |
How to spot GPS IIF-1 from Boston
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 Boston.
Prefer email?
One email tonight before GPS IIF-1 is visible, never more than 2/week.