If the majority of the guests live in the area you should be able to have a map to the reception only. At the conclusion of the ceremony the Pastor can give mention regarding directions to the reception location or who to follow.
Yes, I receive a lot of invitations and 80% have both. It's helpful for out of town guest, include the address as most people have GPS. I have seen some wedding couples include a website they have developed for wedding information regarding there plans and have links to Mapquest for directions as well. www.briggsphotography.com Stockton, Lodi, Modesto