![]() If a 100-meter resolution is enough, 3 + 3 digits suffice if a 1 km resolution is enough, 2 + 2 digits suffice if 10 km resolution is enough, 1 + 1 digits suffice.ġ0 meter resolution (4 + 4 digits) is sufficient for many purposes, and is the NATO standard for specifying coordinates. ![]() If a resolution of 10 meters is enough, the final digit of the easting and northing can be dropped, so that only 4 + 4 digits are used, representing a 10-meter square. The resolution in this case is 1 meter, so the MGRS coordinate would represent a 1-meter square, where the easting and northing are measured to its southwest corner. If 5 + 5 digits is used, the first 5 digits give the easting in meters, measured from the left edge of the square, and the last 5 digits give the northing in meters, measured from the bottom edge of the square. The third part of an MGRS coordinate is the numerical location within a 100,000 meter square, given as n + n digits, where n is 1, 2, 3, 4, or 5. Honolulu is in the 10 km square that is called 4QFJ15. To give the position of Honolulu with 100 km resolution, we write 4QFJ.įigure 2. In the map (figure 1), which uses the AA scheme, we see that Honolulu is in grid zone 4Q, and square FJ. ![]() (Latitude band X is the exception to this rule.) Therefore, a position reported in a modern datum usually cannot be misunderstood as using an old datum, and vice versa – provided the datums use different MGRS lettering schemes. If an MGRS coordinate is complete (with both a grid zone designation and a 100,000 meter square identification), and is valid in one lettering scheme, then it is usually invalid in the other scheme, which will have no such 100,000 meter square in the grid zone. The westmost square in the first row, in zone 1, has identification AL. This means that the letter for the first row is L in odd-numbered zones and R in even-numbered zones.
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