It uses the same DVD drive for the Rear Entertainment System and copies the data to an internal hard drive. AFAIK the actual DVD is not included with the vehicle.
The Nav site should have said your 2011 ody elite is upto date. You do not need to purchase the update at this time.This may sound dumb but where do I insert the cd with the new navigation system. I purchased the upgrade. I have a 2011 Honda Odyssey Touring Elite - can't see any information on: Honda Navigation DVD 2012 & Honda GPS Updates for Accord, Civic, and Odyssey