This AToN Green 59AR at mm 121.8 is where the red and green colors swap!

The Pamlico River follows international standards with red-right-returning. The gold stickers on the AToNs are inverted with triangles on green and squares on red. But here within the Pamlico River-Alligator River Canal at this precise spot the standard flips from International Standards to ICW Standards! Green starts to be on the right for northbound traffic.

A Very cool phenomenon.

This type of change does not happen often in the middle of a waterway!

Below is an example of a green AToN with the triangle gold sticker that we passed earlier in the day on the Pamlico River.

Confused?

Check out this treatise on the subject: http://shellerina.com/2022/03/21/red-right-return/