The answer is: Grids are used to find coordinates (Latitude and longitude coordinates).
<h2>Why?</h2>
Grids are used to find coordinates, it means to find latitude and longitude coordinates. Latitude and longitude help to find the object's positions on earth.
Latitude is a measurement on a map, going from the North to the South, at the opposite side, longitude is a measurement on a map, which goes from the East to the West of the prime meridian at Greenwich.
