GPS IIF-1 over Portland tonight
Pass predictions for Portland, OR.
Next visible pass
Wed, Sep 9, 11:32 AM
Peak elevation 12.67° · rises E · sets NE
Tracking: GPS BIIF-1 (PRN 25) (NORAD 36585)
7-day pass forecast
| Date | Time | Peak elev | Rises | Sets |
|---|---|---|---|---|
| Sep 9 | 11:32 AM | 12.67° | E | NE |
| Sep 9 | 11:40 PM | 70.49° | NW | S |
| Sep 10 | 11:28 AM | 12.67° | E | NE |
| Sep 10 | 11:36 PM | 70.49° | NW | S |
| Sep 11 | 11:24 AM | 12.67° | E | NE |
| Sep 11 | 11:32 PM | 70.50° | NW | S |
| Sep 12 | 11:20 AM | 12.67° | E | NE |
How to spot GPS IIF-1 from Portland
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 Portland.
Prefer email?
One email tonight before GPS IIF-1 is visible, never more than 2/week.