I have a large KML file (I also have it in GPX format but I've been using the KML so far) with LOTS of walking paths in it, criss-crossing most of France (mostly the GR routes but with a couple of others). I have imported it and been able to view it happily in both Google Maps and Google Earth.
When I ask Google for directions between 2 points on these paths, it ignores them and uses paths/roads etc that it knows about. What I'd like it to do essentially is replace the built-in roads with my KML paths, and find me the a route along those instead.
Is there any mapping software capable of this?
MacOS would be the preferred target, but I'm happy with any OS as I'm on a Mac with windows on bootcamp and a few Linux VMs. Free solutions would be great; as for paid solutions I'd rather not set any boundaries, as though I wouldn't actually pay beyond a small fee to do this (I can do it by hand if I need to after all), I'd be interested to know that such software existed!