What type of topmark is associated with Safe Water Marks?

The type of topmark associated with Safe Water Marks is a single yellow cross. Safe Water Marks are used to indicate that there are navigable waters ahead, often marking the entrance to a channel or the centerline of a waterway. The yellow cross is a distinctive visual cue that helps mariners recognize safe waters and is standardized in the IALA buoyage system.

The single red sphere, while used in other buoyage systems, does not represent safe water. Double green cones signify preferred channels or directions, indicating a specific course to follow and not safety. Double blue balls are used to denote special marks for geographical areas or specific protection, rather than indicating safe water. Understanding these distinctions is critical for navigating waters safely and effectively.