Which color is not used in lighted navigation aids?

Which color is not used in lighted navigation aids?

• A. Blue
• B. White
• C. Red
• D. Green

Answer: (A)

In lighted navigation aids, colors are standardized to convey where safe passage lies. Red indicates the port side of a channel (left when facing upstream or toward the sea), and green marks the starboard side (right). White lights are common for general navigation aids, providing visibility or signaling the presence of an aid itself. Blue, on the other hand, isn’t part of the standard color scheme for regular navigation lights, so it isn’t used for typical channel markers or lighthouses. If a blue light appears, it’s typically not a standard navigational aid color and may be a special-use signal or something outside normal navigation lighting.

In lighted navigation aids, colors are standardized to convey where safe passage lies. Red indicates the port side of a channel (left when facing upstream or toward the sea), and green marks the starboard side (right). White lights are common for general navigation aids, providing visibility or signaling the presence of an aid itself. Blue, on the other hand, isn’t part of the standard color scheme for regular navigation lights, so it isn’t used for typical channel markers or lighthouses. If a blue light appears, it’s typically not a standard navigational aid color and may be a special-use signal or something outside normal navigation lighting.