Hydrographic charts prepared for navigation should include which type of features to assist navigators?

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Hydrographic charts for navigation provide not only depths and hazards but also recognizable surface features that help you determine where you are. Including landmarks useful to the navigator gives you visual reference points to fix your position relative to the shore, especially in coastal approaches, harbor entrances, or when electronic navigation is impaired. Real landmarks like towers, churches, distinctive cliffs, or named harbors give precise cues that align with the chart. If a chart had fictional landmarks, it would be unusable for real navigation. A chart with no landmarks removes these essential cues, making it harder to determine position. Relying only on subsurface hazard details ignores the surface references you need to orient yourself and verify information such as bearings to aids to navigation, depth, and contours near the shore.