You are inbound in a channel marked by a range. The range line is 309°T. You are steering 306°T and have the range in sight as shown in illustration D048NG below. Which action should you take?

Correct Answer: Option D — Immediately alter course to the right to bring the range in line.

Navigating inbound on a range where the upper light shifts off-center requires altering course immediately toward the visual displacement to regain the centerline before establishing the final steering heading.