World Maps Explained * digital - free *
Azimuthal World Maps Explained - free digital download
This 1-page Explanation was prepared by Len Guelke, the cartographer who created our collection of City-Centered World Maps.
Len has been passionate about Azimuthal map projections and created hundreds of custom city-centered maps for individuals, professional associations, web sites, and especially for regional marketing associations.
An example of what he did for Chicago is HERE.
That page also has links to a video explaining city-centered maps