Which type of chart shows depth information for navigation?

• A. Nautical Almanacs
• B. Depth charts
• C. Weather charts
• D. Tide tables

Answer: (B)

Knowing the depth of the water along your route is essential for safe navigation, especially in shallow or congested waters. Depth charts convey this by showing bathymetry—the underwater contours and actual depths at various spots—often with soundings and depth contours tied to a chart datum. This lets you plan a course that stays clear of shoals and grounding hazards and ensures your vessel has sufficient under-keel clearance.

Other options serve different purposes: nautical almanacs provide celestial navigation data, weather charts depict atmospheric conditions, and tide tables predict how water levels rise and fall over time. They help with timing and planning, but they don’t display the seabed depths you need for steering a safe, shallow-water passage.