What is the maximum accurate 10-digit grid distance in meters?

• A. 4000 meters
• B. 8000 meters
• C. 6000 meters
• D. 10000 meters

Answer: (C)

Understanding grid distance with a ten-digit grid reference means you’re using meter-level precision from standard field map gridding, but that precision only holds up to a certain range because of map scale and plotting tolerances. In typical Marine Corps plotting, the practical limit for maintaining that level of accuracy is about 6,000 meters. Beyond this, the small errors from aligning the ruler with grid lines, parallax in sighting, and the finite thickness of grid lines accumulate enough that the distance can no longer be trusted to the nearest meter. So 6,000 meters is the furthest distance you can reliably report with ten-digit grid accuracy. Distances like 4,000 meters remain accurate, while 8,000 or 10,000 meters exceed the reliable limit for this method.