It would be useful if the subway map could have clickable destinations as well. For example...
I'm in Bortola and I want to get to Shimla Mirch. I know I'm going to take the subway, but I don't really know where my nearest subway station is. Rather than hunting on the main map and setting the destination there, I could click on the Bortola subway station on the subway map and that sets my destination for the walk to the station.