What type of marker helps in providing navigation information?

The correct answer focuses on square markers, which indeed serve a key role in navigation. Square markers are used for informational purposes, such as indicating locations of docks, marinas, and other navigational aids. They help boaters understand where they can find services, rest areas, or safe areas to anchor.

In the realm of navigational aids, each type of marker has its unique function. For instance, nun buoys, which are often conical and colored red, typically indicate the right side of a channel when returning from the sea. Diamond markers can denote hazards or areas that require caution, while circle markers are generally used for indicating controlled areas, such as swimming zones or no-wake zones. Understanding these distinctions is crucial for safe navigation on waterways.