navi conversion device

I have a 04 yukon denali. Does anyone know the name of any companies or shops that offer the navigation conversion, which allows your OEM nav to play from your aftermarket dvd or ps2....

I'm trying to remember - I want to say the company was called NYC Video, but a quick Google search didn't yield anything. Sorry about that. I remember their pricing was really high - something like $800 for what amounts to a firmware upgrade.

Take care,
Jerry