What does Red/Brown indicate on a red-light readable map?

• A. Elevation only
• B. Hydrography
• C. Vegetation
• D. Cultural and relief features

Answer: (D)

In red-light map reading, colors are chosen so you can pick out essential features without full lighting. The red-brown color is used to mark both cultural features (things built by people like towns, roads, boundaries, and buildings) and relief features (the shape of the terrain, shown by contour lines and elevation cues). So when you see red/brown, you’re looking at where human-made features exist and what the terrain is like overall, which is crucial for navigation at night.

This differs from blue for water, green for vegetation, and brown alone for elevation contour lines. The combination of cultural and relief information in red/brown makes it the best indicator for those two categories together.