2005 RL Navigation DVD Drive Question

Hello all,

I have a 2005 RL with the ubiquitous failed Navi DVD Drive. I am contemplating using a later version of the DVD Drive so that I can have the Navi working again, as I find it useful. Apart from the Drive and Anti-theft code, what else do I need? At the moment I have just the original DVD maps that came with the car. Do I need a more recent DVD or any other updates to make this stuff work? I ask all this to decide if getting it all working is cost effective or not.

Thanks in advance for all and any help.

Neil M.