sketch map

a rough map of the principal features of a locale, as one drawn from memory.

1870–75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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sketch map

a map drawn from observation (rather than from exact measurements) and representing the main features of an area 
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
It may be useful to offer a brief resume of the main themes of the book, by way of a sketch map for a long journey.
Selecting within the rectangle will display the relevant sketch map.
For each location, an illustrative map and a zoning sketch map are provided.
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