What term identifies the requirement to post charts or lists near the weather technician's position to identify observing aids?

• A. METAR
• B. Observing Aids for Visibility
• C. SPECI
• D. PIREP

Answer: (B)

In weather observation, it's essential to have clearly identified observing aids available at the observer’s position so everyone knows which tools or references are being used to determine visibility. The term for this requirement is Observing Aids for Visibility, which refers to posting charts or lists near the weather technician to identify the observing aids in use. This practice ensures consistency and accuracy in how visibility is measured and reported, and it helps others verify the methods behind the observation. The other terms listed refer to types of weather reports (METAR, SPECI) or to pilot reports (PIREP) rather than to the requirement to display observing aids.