Show boundaries of downloaded areas that are accessible while offline
When zooming around downloaded maps it would be really useful to be able to see which areas have what level of tile available. A simple box over the area containing a number for maximum level of detail would be sufficient.
What I noticed was that after downloading a high res map (level 17) of a small geographic area of the UK I could zoom out of the area and still see map coverage at a lower level, up to a certain point when there was subsequently no data available so we simply got the grey squares. Obviously, within the depicted map there is a different level of detail available: level 17 for the small high res area and some lower level for the areas outside the high res coverage. It would be useful to know where those boundaries are.
When I pan the map over to the North American west coast I see at a low level of coverage a very large area comprising the the whole of Washington state and most of British Columbia. Now I know that within this area there are high resolution tiles available for the area around Vancouver, but I can't tell that by simply looking at the coverage. I have to know it by remembering what I've downloaded previously. It would be useful to have the high coverage area depicted somehow by an area rectangle containing a number showing the highest level of detail available in that area.
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