If you want to create custom rides from specific points that don't have addresses in Google Maps you'll need to know the latitude and longitude of those places. Here's how.
- Head over to Google Maps
- Search for an interesting place you'd like to ride around.
- Grab the little Street View human in the bottom right of the screen.
- Drop them on the road
- This highlighted portion of the url at the top of your web browser is the lat and lon. Copy and paste this into your starting location.
That's all there is to it!
This video explains the process as well.