Satellites - General Information

This page shows overview information about the satellites being tracked and the overall GPS constellation.
Tracking n Satellites:
Shows the total count and PRN numbers of the satellites currently being tracked. This display includes WAAS and EGNOS satellites as well as GPS.

Total GPS Constellation:
Shows how many GPS satellites are currently in orbit.

Healthy Satellites:
Shows how many GPS satellites are currently thought to be healthy, that is, fully operational. This information comes from the most recent data transmitted in satellite almanacs.

Unhealthy Satellites:
Shows how many GPS satellites are currently thought to be unhealthy. Typically, unhealthy satellites will not be tracked, measured, or used in position calculations.

User Disabled Satellites:
Shows which satellites, if any, have been intentionally disabled by the user. Typically it is not recommended that satellites be intentionally disabled.

User Ignore Health Satellites:
Shows which satellites, if any, have been intentionally enabled by the user, even though the satellite is declaring that it is not healthy. Typically it is not recommended that bad satellite data be intentionally enabled by ignoring health information. The use of measurements from satellites that are truly unhealthy can degrade the performance of GPS positioning.

WAAS/EGNOS usage is enabled for:
Shows which WAAS/EGNOS satellites, if any, are enabled for use.
The information on this display is updated every five seconds.

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