Support ECW format. With its built-in metainf, or ecw + otrk, or ecw + map.
"Folder mode" for offline maps autoloading:
If (on zoom change(if zoom not exist on the current map) or leaving map boundaries) a suitable(by zoom and by coordinates) map exist in folder with current map, load it(the first available) without asking (without displaing a list available maps and loaded map name).
Any online maps can be viewed, downloaded and converted to ecw/jpg/png/bmp/kmz/jp2000 (+map/dat/kml/tab/w) with