The iPad is more than capable of helping you get to your destination while you are driving. At the very least, you could use it to check out maps when you are lost. You should consider picking up a car mount for your tablet if you are serious about using it during your road trips. These 3 cup holder mounts can keep your device steady as you drive:
Satechi SCH-121 Cup Holder Mount: compatible with the iPad, iPad 2, ASUS Eee Pad, and other tablets. It offers 180 degree vertical and horizontal adjustment.
RAM Mounts for the iPad: these guys are known for their mounts and other accessories for gadgets. Their mounts cover all iPad generations.
ARKON Cup Holder Mount: compatible with the iPad 4 and iPad 3. It fits most cup holders and has a flexible neck. Its 180-degree tilt-swivel head allows maximum viewing positions.
You could always use a windshield mount to hold your iPad but that might distract you. The choice is up to you.