When a satellite fails, even if that failure is detected by an earth-based
monitoring station, it can be some time before an uplink to that satellite
can occur. During that time, there is no way for a GPS receiver to know
that the information from that satellite is bad directly from that
satellite’s transmissions. An integrity monitor, such as RAIM when it
is available, protects you from false or misleading navigation displays
resulting from bad satellite information.
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Operations RAIM
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