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2.3.2* i) SPECI is not issued if the height of base of the lowest cloud layer reaches or exceeds the value of
450 m.
4.2.3* When instrumented systems are used for the measurement of visibility, their output is updated
every 60 seconds for ICAO Category II operations; for other cases, their output is updated similar
to METAR and SPECI.
4.3.4 When instrumented systems are used for the assessment of runway visual range, their output is
updated every 60 seconds for ICAO Category II operations; for other cases, their output is updated
similar to METAR and SPECI.
4.3.6.5* When instrumented systems are used for the assessment of runway visual range, the following are
included in METAR and SPECI:
— if the runway length is less than 2 000 m, the lesser of two values, at the start and end of the
runway;
— if the runway length is greater than 2 000 m, the lesser of two values, at the start and mid-point
of the runway.
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