What is meant by “recommended course lines” in navigation?

“Recommended course lines” refer to the suggested routes that navigators are advised to follow for optimal navigation in specific waters. These routes are established based on a variety of factors including navigational hazards, traffic density, environmental considerations, and the general safety of passage. By adhering to these recommended routes, vessels can minimize risks such as grounding or collisions and ensure a more efficient travel through busy or challenging areas.

This concept is especially crucial in regions where navigation can be complicated due to various restrictions or hazards, as well as in busy shipping lanes where many vessels operate. Following these suggested routes aligns with safe navigation practices and helps maintain order in maritime traffic, contributing to overall maritime safety.

The other options do not accurately describe recommended course lines. For example, estimating distances traveled pertains to navigation calculations rather than routes themselves, while instructions on maintaining a heading and guidelines for anchoring pertain to different navigational concepts that don't directly relate to the predefined paths established for vessels.