Using a grid reading device, a square 4.2 cm on edge, with each edge divided into ten segments, one can interpolate distance to about 10 meters. There is a small hole at the origin. The device is used by placing the origin in the Southwest corner of the UTM grid square and aligning the edges with the UTM lines. The distance between lines in the device represents a distance of 100 meters. Grid reading devices are included in each radio chest pack the Unit owns.
Some compasses have a scale scribed on their baseplate which can also be used.
If the location is between the fifth and sixth lines of the grid reader, the next digit of the easting component would be 5. If the location is between the seventh and eighth lines on the grid reading device, the next digit of the northing component would be 7. The full position description is the zone description, the easting component and the northing component. Some people put a zero in front of the easting component so there are the same number of digits in both components. The accuracy of that additional digit is a matter of discussion.