What do the numbers and colors mean on the channel marker?

Channel markers use numbers and colors to indicate navigation information. Typically, red markers are used on the right side of a channel when approaching from the sea (even-numbered), while green markers are on the left (odd-numbered). The numbers often correspond to the distance in nautical miles from a designated starting point, helping mariners determine their location. These markers assist in safely navigating waterways by indicating safe paths and hazards.