I've put together a simple carputer to handle the balloon tracking and map plotting automatically. It's essentially a smallish desktop running from an inverter, with a backup battery & diode block to let me start the car without rebooting the PC.
The Icom 706MKIIG is controlled by the PC for automatic tuning & tracking - there's also a GPS module onboard, a 3G internet connection, and an ad-hoc wifi network broadcast, allowing me to control the lot from my netbook. Velcro straps keep the whole thing from sliding around in my boot.
More info soon, pics below!