Context Maps are able to answer a high variety of questions such as:

how does the model of a given system propagate through an application landscape?

which kind of influence does a certain team have on others?

who has an influence on a given team?

how are politics being played?

As you can see: these questions are very specific, and we can answer them based on a big context map but such a context map will sooner or later turn into an information overload.

Therefore:

Work with smaller context maps, aimed to answer specific questions. Only include those patterns to these smaller context maps that help you in answering these questions.