Using BC or MS to lay out a ride is not the way to go. Use one of the online mapping sites(I like www.ridewithgps.com) to lay out a route than, as suggested above, move the route or track file to your gps with either Mapsource or Basecamp. If you're talking about downloading an ACA file to the gps, I can't help you with that. Never done it. The link might have a helpful idea or two.