A nautical chart is a detailed map used for maritime navigation, depicting water depths, shorelines, navigational hazards, and aids to navigation like buoys and lighthouses. It is essential for planning voyages and safe navigation, providing critical information on seafloor configuration, tidal depths (chart datum), and safe anchorage locations.

Key Charting and Navigation Terms:
Chart Datum: The reference water level, typically low water, used for soundings; water rarely falls below this depth.
Soundings: Numbers on a chart indicating water depth, usually measured in meters, feet, or fathoms.
Compass Rose: A figure on the chart showing true and magnetic north, used to calculate bearings.
Position Fix: An accurate, plotted position on a chart determined by navigational aids or celestial observations.
Dead Reckoning: Estimating your position by applying speed, time, and course to a previously known position.
Chart Scale: The ratio of distance on the chart compared to the actual distance, with larger-scale charts providing more detail.
Contour Lines (Depth Contours): Lines connecting point

Essential Chart Features:
Navigation Aids (ATONs): Represented by symbols indicating buoys, lights, lighthouses, and beacons that help guide vessels.

Chart Title/Legend: Provides critical information regarding scale, projection, unit of measurement, and date of survey, notes a scribd.com document.

Obstructions: Symbols that indicate dangers to navigation like wrecks, rocks, or underwater cables.

Proper chart usage involves checking the title for the scale and datum, then identifying hazards before navigating.