Overlay Airport Taxi Data Not Available

I would like to overlay the airport chart onto the world map, but when I hover over the button it has an X over the cursor. I figure I must be doing something wrong but cant figure it out. I can overlay the approach plates onto the map no problem.



The overlay option is not available for taxi charts on enroute map owing to the small scale of these taxi charts. The new Charts in development has higher zoom levels so hopefully we can consider your suggestion.