GPS IIF-1 over Istanbul tonight
Pass predictions for Istanbul, TR.
Next visible pass
Sun, Jul 26, 5:15 AM
Peak elevation 34.22° · rises SE · sets SE
Tracking: GPS BIIF-1 (PRN 25) (NORAD 36585)
7-day pass forecast
| Date | Time | Peak elev | Rises | Sets |
|---|---|---|---|---|
| Jul 26 | 5:15 AM | 34.22° | SE | SE |
| Jul 26 | 11:50 PM | 83.39° | W | SE |
| Jul 27 | 11:46 PM | 83.39° | W | SE |
| Jul 28 | 11:42 PM | 83.38° | W | SE |
| Jul 29 | 11:38 PM | 83.38° | W | SE |
| Jul 30 | 11:34 PM | 83.37° | W | SE |
| Jul 31 | 11:29 PM | 83.37° | W | SE |
How to spot GPS IIF-1 from Istanbul
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 Istanbul.
Prefer email?
One email tonight before GPS IIF-1 is visible, never more than 2/week.