You are in a channel inbound from sea. A daymark used to mark a channel junction, when the preferred channel is to port will have the shape indicated by what letter in illustration D045NG below?

Correct Answer: Option D — D

A junction mark with the preferred channel to port is a green square with a red horizontal band. In standard USCG illustration D045NG, the square shape (D) represents the port-side lateral mark, which, when modified with a red band, indicates the preferred channel lies to the port side.