I carry an OS map of my local area (151 if I remember correctly) in my EDC, along with a compass. Very useful if TSHTF and I need to get home/get out via routes not normally used.
I carry a London A-Z and a pocket road map of the UK in my EDC for my daily commute to London. I'v never carried an OS map around in my EDC, simply because I travel to great a distance each day, I'd need about 3-4 of them!