What do you need if the Zombie Apocalypse occurs? How about a map of resources including food, weapons, medical, and weapons. That would be helpful. You can look at the map for your area. It can display the map with the danger zones (red is more dangerous because more populated), without the danger zones, and with a traditional map.
Remember most areas with resources will also be the most densely populated and be more dangerous.
This is a fun map program. Click on the link below and pull up your address to view your Zombie Survival Map.