Satellites - General Information
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This page shows overview information about the satellites being tracked
and the overall GPS constellation. This information is updated every
five seconds.
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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.
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Total GPS Constellation:
Shows how many GPS satellites are currently in orbit.
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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.
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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.
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User Disabled Satellites:
Shows which satellites, if any, have been intentionally disabled by the
user.
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User Ignore Health Satellites:
Shows which satellites, if any, the user has indicated should be used
even if they are indicating an unhealthy status. This mode of operation
is not recommended. The use of measurements from satellites that are
truly unhealthy can degrade the performance of GPS positioning.
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WAAS/EGNOS usage is enabled for:
Shows which WAAS/EGNOS satellites, if any, are enabled for use.
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