The map atlas is large (10x13 inches) and spiral bound book, so it is not necessarily something you would walk around with; but it is an excellent reference tool to find locations and addresses that you may need to go to. It is essentially a five(5) Borough street map. It also has a key map which provides an overview of the sections represented by each map. It provides additional information, such as parks, beaches, and points of interest, and a street index cross-referenced with individual atlas map pages. You can find airport data and postal zones. I have it, and I use it as a supplemental tool to find my way around the city. An essential tool.