HACK THS

Figured since the microphone would have to be a decent one for a car I wanted to see if I could somehow terminate the mic to a mini-jack and use it for my car computer- nav etc. Is there any way to do this. I would basically like the mic active when the car is running- this way I could always just unplug the mini-jack from the computer. I am leaning towards the idea that this is not possible, but figrued I would ask.