Yes, otherwise it's copyright infringement. I've been working on a mobile app for some time. As an indie developer, the map license is almost fatal for my project.
I have however seen people get around this by making their own version of the map; often opting for a map that more closely resembles the true relative positions of the stations.
Naturally this CSS map is an almost 1-for-1 copy of the original. But how far would it have to diverge to not be copyright infringement? Different colours? Use rounder angles ?
