This relation need not be 1/10000, but may be anything from 1/100 that an architect might use in making a map or plan of a house up to one over a billion and a half, which is about the proportion between map and real distances in a pocket-atlas representation of the whole world on a 6-inch page.

Jack was provided with a large atlas map of Virginia, and with the bits of information given by Dick he was able to conjecture the probable plan of the next day.