What is the function of lateral marks in navigation?

Lateral marks play a crucial role in navigation by guiding vessels through specific channels. These marks are part of a system designed to indicate the safest route for mariners to take, ensuring that they remain within navigable waters. Typically, lateral marks are positioned to indicate the sides of a channel, helping vessels determine which direction to navigate when entering or proceeding through restricted or narrow waterways.

The use of colors—red and green—on the marks further aids in navigation; mariners will follow the "red, right, return" rule in many systems, where they keep red marks to the right when returning from sea. This clear signaling helps prevent groundings and accidents by providing visual cues that direct mariners safely along their intended paths.

While some of the other options might include elements of navigation, the primary purpose of lateral marks centers on guiding vessels through specific, designated routes.