I can't answer your specific question, but you can create routes and courses on mapmyride.com and upload them to the 705. You don't need the MapSource application to do that. You do need it to be able to view the maps in Training Center. But as long as you have an Internet connection, you can view your routes plotted on Google Maps in SportTracks.
If I'd realized that MapSource wasn't included with the 705, I would've bought City Navigator separately rather than bundled. But the only time you'd really miss it is when you're offline, which is rare for most people nowadays.
Speed comes from what you put behind you. - Judi Ketteler