Use a laptop running
eTrex with the serial cable
GSAK with PQ's
Steets and Trips
Palm with Mobipocket
Verizon Wireless EVDO for internet
We can track where we are with S&T's , use GSAK and PQ's to filter on what we want, as we travel. Use the export function on GSAK to display caches on S&T's. Use the palm to take with us after we leave the car, to read cache info. And use the wireless card to log finds instantly, or verify cache pages.
Almost had to add a second battery the car. And yes, my wife thinks I'm a geek.