What color and type of marker should be kept on the port side when entering a channel?

When navigating a channel, the standard system for identifying the placement of markers is critical for safe passage. According to the U.S. Aids to Navigation System, when entering a channel from open water, the markers on the port side (left side) should be red in color. These red markers are used to indicate the starboard (right) side of the channel as you are approaching from seaward.

The correct choice specifies that markers on the port side should be red colors and even numbers. The mention of even numbers corresponds with the marker numbering system where red markers, signifying the port side, are assigned even numbers. This system helps boaters identify their location and navigate safely, ensuring they stay within the safe limits of the channel.

Understanding this system is essential for maintaining safe navigation practices, as it aids in recognizing the correct side of the channel to navigate towards while avoiding potential hazards.