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Old 3rd April 2008, 10:30   #5 (permalink)
AMEX
 
Join Date: Apr 2003
Location: Near the sun
Posts: 654
ICAO Annex III

Quote:
4.9.1.2 Recommendation.— In automated METAR and
SPECI, visibility should be reported in accordance with provisions
relevant to METAR and SPECI included in Section 4.2.
However, when visibility sensors are sited in such a manner
that no directional variations can be given, visibility value
reported should be followed by the abbreviation “NDV”.
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