Which position reference system is point-centric and uses alphanumeric coordinates with letters for the box and numbers for gridlines spaced every kilometer?

• A. GARS
• B. Bullseyes
• C. MGRS
• D. WGS84

Answer: (C)

MGRS is a point-centric grid system that encodes a precise location by first identifying a 100-km square with letters and then providing numeric easting and northing within that square. The letters designate the box, and the subsequent digits mark gridlines spaced at one-kilometer intervals, giving location precision at the kilometer level. This combination lets you pinpoint a single point rather than describe a broad area. WGS84 is a datum, not a grid reference format, so it’s about the earth model used for coordinates rather than how those coordinates are written. GARS is an area-reference scheme that covers large regions with different coding rules, not the 100-km-square plus meter-level within-square scheme of MGRS.