Reference circle is described as which of the following?

• A. A circular plan view symbol indicating wind
• B. The circle depicted in the plan view of an IAP chart that typically has a 10 NM radius, within which chart elements are drawn to scale
• C. A circle showing the aircraft's current position
• D. A circle representing the radar coverage area

Answer: (B)

The reference circle is a visual scale guide on instrument approach procedure charts. It’s the circle shown in the plan view centered on the airport that typically has a 10 nautical mile radius, and everything inside it is drawn to scale. This lets you gauge distances between fixes, navaids, and the runway as you trace the approach. It isn’t a wind symbol, it doesn’t show your current position, and it isn’t a representation of radar coverage. Outside that circle, the chart may not be to the same scale, so distances beyond it aren’t interpreted in the same way.