from what i've read about this process, if u already have the TV tuner and NAV equipment, all u need is the $199 module. the experts here can probably give u more details, but from what u describe, all u should need is the $199 module.

w/o this module, the dealer is right. when in motion, u will not have display on the NAV screen. in ur current setup, w/o purchasing this module, u can not have video in motion. it is the module that allows this.

experts, back me up on this or please correct me if i'm wrong.