I have a wifi ipad and was wondering if I connect a bluetooth gps to it, will motionx allow me to download the app? Right now it says not compatible.

What blue tooth GPS? To my knowledge, there is only one that works with the an unjailbroken iPad BT Stack: GNS 5870 MFI Bluetooth GPS Receiver for iPad - iPad GPS Receivers - iPad Forums Store

I use MotionX GPS Drive HD on my iPad, but I have the 3G version so I don't worry about any kind of puck. The app is great, nonetheless. I know this doesn't answer your question, but we need more info.

Sorry about that, I have a j/b ipad and am awaiting this receiver Visiontac VGPS-700.

An update to this thread.
I received the visiontac gps receiver. It came with a wall charger, car charger, and a battery backup emergency charger. The unitnitself is about the size of a zippo lighter. Using roqybt, I was able to sync it up to the iPad with no problem.
The one drawback is that MotionX Drive will not download to a non 3G iPad. I ended up buying Navigon, which I found to have a more robust, if not more cluttered interface. The price point made me pause, but in the end I am extremely pleased.