AMEDD Direct Commission Course (DCC) Practice Exam

How many digits should a grid coordinate be for standard use?

8-10 digits 6-8 digits 12-14 digits 4-6 digits

Correct Answer:

8-10 digits

Explanation:

Grid references are built from pairs of digits that separately define how far east and how far north you are within a grid. Each additional pair of digits increases precision by a factor of ten. Specifically, two digits per axis give about 1,000-meter accuracy, three per axis about 100 meters, four per axis about 10 meters, and five per axis about 1 meter. For everyday field use, eight to ten digits total (four digits for easting and four for northing, or five and five) provide roughly 10-meter to 1-meter precision. This level is usually sufficient to locate a point on a map clearly and communicate it reliably, while longer coordinates offer more precision than typically needed and can be harder to read in the field.

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