A map is "a representation, usually on a flat surface, as of the features of an area of the earth or a portion of the heavens, showing them in their respective forms, sizes, and relationships according to some convention of representation." ~ dictionary.com
A gazetteer is "a geographic dictionary or index." ~ The American Heritage Dictionary of the English Language, 4th ed.
An atlas is "a bound collection of maps." ~ dictionary.com
GPS or global positioning system is "a system of satellites, computers, and receivers that is able to determine the latitude and longitude of a receiver on Earth by calculating the time difference for signals from different satellites to reach the receiver." ~ The American Heritage Dictionary of the English Language, 4th ed.
GIS or geographic information system is "a computer application used to store, view, and analyzie geographical information, especially maps." ~ The American Heritage Dictionary of the English Language, 4th ed.
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