I guess I need to be more specific.
The stock head unit in the cabin does not support a remote control, so yea, the head unit will need to be replaced.
I'm refering to a remotely mounted controller, one or multiple controller(s) is permanently attached to a specific location(s) such as the console or swim platform or anywhere else you would want to control the stereo from without having to keep track of a regular remote control.
example:
http://www.alpine-usa.com/product/view/mc20
several manufactures make a system like this, I just wondered if anybody as purchased one and if you were happy with its performance?