What is the purpose of a grid reference on a map?

• A. To measure distance
• B. To identify terrain features
• C. To estimate elevation
• D. To identify a precise location on the map

Answer: (D)

Grid references identify a precise location on the map by using the grid that overlays the map. Each reference combines eastings and northings to mark where two grid lines intersect, pinning down a single point. With more digits, you narrow that point to a smaller area, increasing precision from a whole grid square to within tens of meters depending on the map’s scale. This exact pinpointing is what makes it the best tool for navigation: you can tell someone exactly where to go or where an event occurred, and you can navigate straight to that spot.

Measuring distance relies on the map’s scale to estimate how far apart points are, rather than pinpointing an exact location. Identifying terrain features comes from recognizing symbols and what the ground looks like on the map, not from the coordinates themselves. Estimating elevation uses contour lines and spot elevations, not grid coordinates.