Hi there,
You can't do it like this, the MapSource software does not include the maps, for that you need to buy City Navigator 2010 from Garmin.
However, I don't think this will solve your problem as as far as I can see pre-planned routes cannot be downloaded onto the nuvi 310
Your best bet therefore is to try and make the route on the unit using waypoints but be careful doing this as I think the recalculate function on this unit cannot be switched off either, so if you make a wrong turn during the route, the route will be automatically recalculated.
As you can probably see, this unit is not really ideal for what you want.
My advice would be plan your routes using a map in the tank bag and simply use the gps to follow them visually, or get yourself a unit which can handle routes properly (anything from a 2nd hand Streetpilot through to a Zumo would do it)
HTH,
David
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