In the traffic pattern, what is the VISUAL REFERENCE for the turning point from the Downwind Leg to the Base Leg? (Ref: VFR SOP Page 157)

• A) When abeam the runway threshold
• B) When the runway threshold is seen at 45° to the rear on the right or left
• C) When the runway end is seen exactly at a 90° angle
• D) At the moment the tower gives instruction