MAP Overlays

[stainless]

I am looking for a way to overlay a route in google maps.
What I want is to take this map Greenways Oak Ridge Google map
and get it to my google My Maps.
Then I can pull it up in Maps and use my location to see where I am in relation to where I need to be in case I want to take a different route to need to shorted the ride due to darkness.
Most rides I do I can find these maps but cant do anything with them.