Guide
How Accurate Are Satellite Trackers?
Satellite trackers are useful planning tools, but their positions are not direct live measurements. Accuracy depends on orbital data freshness, propagation models and satellite behavior.
Trackers estimate from orbital data
Most public trackers calculate positions from TLE or GP data rather than receiving a live signal from every spacecraft. The result is a short-term estimate of where the object should be.
Fresh data matters most
Low Earth orbit objects are affected by drag and maneuvers. A fresh TLE can be accurate enough for sky watching, while stale data may drift noticeably.
Use predictions as planning signals
For observing passes, a tracker helps choose time and direction. It should not be used for navigation, safety-critical operations or collision avoidance.
Frequently asked questions
Is the map showing a real-time GPS signal?
No. Public satellite trackers usually propagate orbital elements to estimate current position.
Why can predicted pass times differ from what I see?
Clouds, local obstructions, satellite brightness and orbital data age can all affect the observing result.