I got my TCH last month, the only problem i am running into is my portable GPS does not work in the car. I tried two different models Garmin Quest 2 and HP iPAQ 6950. Garmin Quest 2 does not work at all. The iPAQ pick up the reception for a few seconds and drops it. I mounted it with a PDA Caddy right on the center vent on the dash, so both GPS have a clear view of the sky.

When i called the dealership they told me you should not use off the market GPS in your car it may reset all the codes in the car and you may run into all sorts of problems (they may be mixing thinking i am trying to install a GPS instead of using a portable one). Can anyone help me if they had any issues similar to this one and how they resolve this problem. I am planning to install a re-radiating GPS antenna since my iPAQ does not have a external antenna hookup.

Any help would be greatly appreciated.