GPS Satellite Sky Map

Predicted GPS almanac sky map. Waypoints and course. Works offline.

See where you are, how good the fix is, and which GPS satellites should be overhead, predicted from public orbit data.

SATELLITE SKY MAP A polar chart places the GPS constellation above you, computed from the public GPS almanac (US Coast Guard / CelesTrak) propagated with the standard orbit equations for your position and the current time. It is refreshed weekly and works offline from a bundled copy.

These are PREDICTED positions, and the app labels them as such on screen. iOS gives apps no per-satellite data at all — no live signal strengths, no which-satellite-is-in-use, and no GLONASS or Galileo. What you see is where the GPS satellites actually are, not what your receiver is hearing from them.

POSITION AND FIX QUALITY • Latitude and longitude, in your choice of format • Accuracy in metres with a plain quality rating • Altitude, ground speed and course • A gauge that tells you at a glance whether the fix is worth trusting

WAYPOINTS Save a spot, navigate back to it with distance and bearing, and get an arrival alert. Export the lot as CSV or GPX.

LOCK SCREEN CARD While the app is open, a Live Activity shows accuracy, altitude and speed on the Lock Screen and in the Dynamic Island. It cannot keep updating once the phone is locked — this app does not run location in the background — so it marks itself PAUSED rather than leaving a stale reading looking current.

WHO USES IT Hikers and paddlers checking fix quality before relying on it · paragliding and drone pilots · surveyors wanting a quick accuracy read · anyone curious what is overhead right now

Available in 25 languages.