i like TOPO maps, but my favorit map is only available in ZL 14-17 :-[
To get a better overview its better to have a map with lower zoomlevels, so i have searched for a solution.....
with little modification of zoomlevel range in .xml and useing one map as overlay it is possible to use both maps at once ;)
See attached video and have fun
https://www.dropbox.com/s/82skplw68d37waq/Multimap.mp4?dl=0