The degree of details on the map depends upon the zoom level, which makes sense. However, when I zoom out at 1:3 000 000 and beyond all air fields and airspaces are removed from the map. At zoom level 1:2 000 000 the first air spaces and air fields start to show up, but you have to zoom in one more step to see the smaller air fields.

This makes it very hard to get an overview of air fields when planning a trip, even on a 10" tablet. Since you have to zoom in at 1:1 000 000 to see the smaller air fields, you totally loose the overview since you now see only a small portion of the area you want to fly, even for a short 150 miles trip.

==> I suggest SD include a user selectable zoom visibility level in the Mapping menu, just like the "Font Size" setting (or like the "Hide Features Above" etc. in the Mapping/Map Layers). Air Navigation Pro shows all air fields even when zooming far out, giving the user a great overview when planning. This is major issue with SD!