The white dashed lines on the Aeronautical Map represent Air Traffic Control (ATC) sector boundaries, including ARTCC (Air Route Traffic Control Center) and FIR (Flight Information Region) boundaries. When zoomed out, the map displays the name of the controlling agency for each sector.
Similar to other map features like terrain, Airways, and Airspace, these dashed lines can be toggled ON or OFF using the Map Filter buttons or through the Aeronautical Map Settings menu.
ForeFlight ARTCC Labels and Boundaries and Related Settings
FAA ARTCC Labels and Boundaries
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