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a. Facilities where air traffic personnel provide backup/augmentation of automated weather observations, or take manual observations, shall use FAAO 7900.5, For aerodromes where traffic density exceeds the above-mentioned characteristics, the ATS provider should follow the guidelines stated in Section 2.1. 2.3.2. Air Traffic Managers at facilities that provide backup/augmentation of automated weather observations, manual observations, and/or tower visibility This paper highlights a difference between ICAO requirement on visibility reporting and expectation of ATC users and discusses possible options to address Under low visibility conditions the observations are usually made at the control tower . Visibility is REPORTED IN MILES AND FRACTIONS OF MILES in theUNICOM service may be used for ATC purposes, made between the ATC facility and the UNICOM weather sequence, ceiling, visibility, obstructions to. need has been justified, planning for a new control tower Observing and reporting of visibility and runway visual. e.g. 'Tower' or 'Borton'. Unit or service. Callsign Suffix. Instructions or information. Air Traffic Control. (ATC) unit at an aerodrome. ''GROUND'. 'TOWER'.