Nautical charts contain important information such as:

Nautical charts are specialized maps designed to assist with marine navigation. They contain crucial information about water depth, which is essential for safe passage. This depth information, including soundings and contour lines, helps boaters determine whether their vessels can safely navigate certain areas, especially in shallow waters or near hazards. By providing a clear representation of the underwater topography, nautical charts enable boat operators to avoid running aground or encountering obstacles submerged beneath the water's surface.

While other options may seem relevant to boating, they are not the primary focus of nautical charts. Weather conditions, for instance, can change frequently and are typically reported through separate weather forecasts rather than being a permanent feature of the charts. Fishing locations may be of interest to anglers but are generally not represented on nautical charts, as these charts focus more on navigational safety. Lastly, different boat types are not relevant to the information provided by a nautical chart, which is concerned with navigation rather than specific vessels. Thus, the inclusion of water depth is what makes it the key information found on nautical charts.