Kol12

Hi, I want to install an aftermarket headunit. I have the double din factory stereo and sat nav configuration. I've been told that the sat nav screen won't display if the stereo is removed and that it requires some sort of wiring mod to keep the sat nav operational. I'm on a real budget and want to install myself. Just wondering if anyone is familiar with doing a headunit install in the stereo/sat nav version and what the wiring mod entails. Thanks.