As a couple of people had noted, being able to "drive" to a spot, then get out of the vehicle and walk using the hand held seems to work great. Since I sometimes cover a 1000 miles a week, the more I keep my eyes on the road the safer we all are.
Besides, how else can you drink a soda, eat and burger and talk on the cellphone! LOL
As I am learning my Nuvi only looks like it will hold 20 caches, which today I used the coords from my Etrex, keyed into the vehicle to hunt with.
Then, I just got the geocaching app for my IPod touch so I can go wireless!