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They were distant allies to the masters ..... Taxi cab drivers ... who literally hold mental maps of the entire city they worked in and they could figure out how to get to where in ten different ways without the help of any paper map or digital system.
I drove a taxi and dispatched for a couple of years back in the mid '80s. For ease of use, Street Guides were a drivers best friend, because they just gave you concise directions from the closest main road. For instance, if I wanted Elm street, I would find it quickly alphabetically, and it would tell me something like "Runs south from Main St, two blocks east of First Ave." The driver would mainly just need a decent understanding of the main roads and how the numbering system for addresses worked, and they could just flip through it pretty quick without having to spread out a big map. The whole city fit into a neat little paperback book.