Roughly speaking, the correct transit is a heading of
The light is at the bottom left. The yellow line is our track across the bar.
(Needed to edit that, when we left on Monday the 4th August I took much better notice with Belinda watching out the back and calling out when I was in line with the white light. The white light shows when the bottom of the three dotted lines is in line. It really feels like you're going way too close to the northern wall but there you go.)