To measure distance on a Mercator chart between the parallels of LAT 34°30'N and LAT 31°30'N, which 30 mile scale should be used?

Correct Answer: Option C — 32°45'N to 33°15'N

Mercator chart distance scales vary with latitude due to projection expansion. To measure a 30-mile distance accurately between LAT 34Þg30'N and 31Þg30'N, the dividers must use the mid-latitude scale centered at 33Þg00'N, spanning 32Þg45'N to 33Þg15'N.