On airports with several charts, it would be pretty nice to have an option to switch faster between overlayed charts. Currently, you have to open the Airfields tab, scroll & find the necessary chart and click the overlay button. This is sub-optimal from the heads-down time point of view in critical phases of flight. My proposal would be to pre-select/mark the charts you expect to use and have a quick option to switch between.
For example, departure might need one or more ground chart(s), a departure chart, and an area chart. I would like to mark those during the briefing and whenever I choose to overlay any of them, have the option to cycle through all (two-finger swipe? dedicated buttons on the overlay? whatever). A bonus would be to automatically show the departure chart after liftoff and the opposite way around.
Thanks for any thoughts.