Two differences between a chart and map (chart)

• A. Not drawn on; shows topical land masses
• B. Shows harbors, ocean contours and channels, and meant to be written on
• C. Is decorative only
• D. Has no navigational use

Answer: (B)

A primary thing charts are designed for is aiding safe marine navigation. They include features that are essential for plotting a voyage, such as harbors and their approaches, depth information (ocean contours), and navigation channels. In addition, charts are intended to be written on or annotated by mariners—you draw courses, mark positions, note corrections, and record navigational decisions directly on the chart.

That combination—harbors, depths, channels, and the ability to annotate for navigation—best matches what a chart provides. Maps, by contrast, emphasize land features and topography and aren’t primarily used for nautical navigation or for being updated with voyage-related markings, so they don’t fit the described differences.