What would be an authentic reason that someone might use GIS map data

An authentic reason that someone might use GIS map data is that the data produced using the Geographic Information System is multidimensional, i. e. the data obtained from the GIS is a combination of facts, statistics and other important information with its respective location on Earth.

Explanation:

The Geographic Information System is a highly reliable data facility which amalgamates features like capturing, storing, manipulating, analyzing, managing, and presenting geospatial or geographic data in the desired formats.