Has anyone mounted their laptop on the vehicle and used a GPS Mouse Receiver (USB) BU-353S4 like this?
BU-353-USB-GPS-Receiver-SiRF-Star-III-4-Laptop-Notebook

I can get my 1:50,000 and 1:100,00 maps on the GPS unit and my laptop but the GPS screen is small.

It just seemed to make sense to just run the laptop with Ozi and use the USB GPS mouse.