On quad maps, horizontal control station marks are depicted as which symbol?

• A. Black outlined triangles with a dot in the center
• B. Red circles with a dot in the center
• C. Green squares with a dot in the center
• D. Blue diamonds with a crosshair

Answer: (A)

On quad maps, horizontal control stations are shown with a black outlined triangle that has a dot in the center. The triangle shape signals a survey monument, while the central dot marks the exact position of the station. This combination is used because it clearly identifies a reference point used for determining horizontal positions and tying the map to the geodetic network, making it easy for field crews to locate and use these precise control points. Other map features use different symbols or colors, so this specific triangle-with-a-dot symbol distinguishes horizontal control points from other types of marks.