What is the map scale of the USGS topographic map used in the Sector Reference System?

• A. 1:24,000
• B. 1:50,000
• C. 1:25,000
• D. 1:100,000

Answer: (A)

Distances on a map show how map measurements relate to real-world distances. In the Sector Reference System, the USGS topographic maps used are the 7.5-minute quadrangle sheets at a scale of 1:24,000. This means one unit on the map corresponds to 24,000 of those same units on the ground. Practically, 1 inch on the map equals 2,000 feet in reality, and 1 centimeter equals about 240 meters. That level of detail is ideal for seeing contour lines, terrain features, streams, roads, and built landmarks so you can measure distances and identify precise locations. The other scales listed are coarser and offer less detail, which is why they don’t fit the Sector Reference System’s standard, which relies on the detailed 1:24,000 topo maps.