What does the maroon color of GRIDMORA indicate?

The maroon color of GRIDMORA specifically indicates that the highest terrain in that quadrant is greater than 5000 feet MSL (Mean Sea Level). This information is crucial for pilots as it helps them assess terrain hazards during flight planning and navigation.

When flying, awareness of terrain elevations is key for maintaining safe altitudes and avoiding obstacles. By indicating areas with higher elevations, the maroon color serves as a visual cue that prompts pilots to exercise caution and perhaps adjust their flight routes or minimum safe altitudes in those regions. This is particularly important for instrument flight when visual references may be limited.

Understanding the significance of the maroon coloration allows pilots to better navigate and ensure safety when operating in areas that may pose increased risk due to elevated terrain.