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You should probably have a map for your own reference, so that your narration of travel times is consistent for the distances and modes of transportation. Once that is done, then whether you have ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27715 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
You should probably have a map for your own reference, so that your narration of travel times is consistent for the distances and modes of transportation. Once that is done, then whether you have a map listing the locations of the Plot Coupons is up to you and your publisher. I can tell you that no purchase decision of mine has ever been influenced by whether the book had a map.