Chris:
You could possibly use a WAC chart to supplement a normal road map - the WAC chart has some useful topographic information on it - but I certainly would not use a WAC by itself for overland navigation, simply because the cultural data on the WAC charts is very, very old. Normally, cultural data (roads, towns, and so forth) is only updated perhaps once every 10 years.
If it helps to give you a perspective on things, I am an aircraft pilot by profession, and I work in lesser developed areas such as Africa. I normally buy a Michelin map to supplement the WAC charts that I use for aeronautical navigation.
Michael
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