“TIS Coasting” to indicate that the target information is
between 6 and 12 seconds old. This may happen if the
TIS-A sensor has missed a radar sweep. Target brightness
is also reduced to indicate this condition.
“TIS Unavailable” to indicate the TIS-A sensor is
operating, but outside of TIS-A service coverage.
“TIS Standby” to indicate the TIS-A sensor is in standby
mode and not processing TIS-A information, even if it is
available.
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Detailed Operation
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