Hi and please help

I'm looking at Kenwood DNX 7200 on ebay. I don't use a mobile phone but would like to run Sat Nav (which I'm sure is standard with these units) and my Ipod.
Presumably the following are extras but do I need them-
KCA-BT100 (is this for the phone?)
GTM-10 (Aerial?)
KCA-IP200 (iPod lead so I assume I need this?)

the 7200 come with the sat nav aerial as the sat nav is buuilt into the unit.

the bt100 interface is for bluetooth

the ip200 is the direct USB ipod lead for audio only and the ip300v is the audio and video lead for those with ipod video that want to use the ipod to play movies on the 7200