Remember the phrase, "Upstream, Red Port Left". Using this phrase, we can determine that the red port marker is on the left, and the green starboard marker is on the right when going upstream.
Now, as this question asks about downstream, the markers are now kept on the opposite side. So instead of green being on your right, it's now on your left.
Remember the phrase, "Upstream, Red Port Left". Using this phrase, we can determine that the red port marker is on the left, and the green starboard marker is on the right when going upstream.
Now, as this question asks about downstream, the markers are now kept on the opposite side. So instead of green being on your right, it's now on your left.