Chart scale meaning is best described as the ratio of map to real world. Which option reflects this?

• A. Chart age in years
• B. Ratio of map to real world
• C. Depth units per inch
• D. Direction of magnetic north

Answer: (B)

Chart scale shows how distances on a map relate to distances in the real world; it’s a ratio that links map measurements to real-world measurements. The best description is the ratio of map to real world because it directly expresses that relationship, for example a scale of 1:50,000 means 1 unit on the map equals 50,000 of the same units in reality. The other options don’t capture this horizontal distance relationship: chart age tells you nothing about distance; depth units per inch describes vertical depth or elevation without tying map distance to real distance; and direction of magnetic north is about orientation, not scale.