During an emergency, often roads and highways that you are familiar with will become impassable either due to congestion or downed trees and power lines. You may not be able to count on a gps to navigate you around these hazards. That is why it is crucial that you include maps in your car kit. One of the best ways to get detailed maps is with an atlas. It may also be in your best interest to put in in a waterproof bag in case you have to abandon your vehicle and go on foot.