The size of square represented by a given coordinate will vary with the coordinate's precision. The Easting and Northing always refer to the southwest corner of the grid square. When using less precise representation, it is important to truncate rather than round the Easting and Northing values. Worse, there is no visual clue that an error has been made, until the coordinate is plotted. Slipping a digit left or right results in a very different position. Note: It is easy to make an mistake using truncated position formats. Locates a point within a 10,000 meter or 10 kilometer square Locates a point within a 1,000 meter or 1 kilometer square Locates a point within a 100 meter square Locates a point within a 10 meter square Locates a point within a 1 meter square The MGRS format is designed to support measurement precisions of 1m, 10m, 100, 1,000m, and 10,000m.īy truncating the grid coordinate values. Truncated position formats for less precise positions I would encourage you to use spaces when writing MGRS coordinate strings,Īnd to pause briefly between logical parts when communicating MGRS coordinate strings verbally. The understanding and communication of coordinate strings between humans. The inclusion of spaces to separate the logical parts of the coordinate string has been shown to facilitate Marks and all the letters are to be capitals." I have not strictly followed this part of the standard in these tutorials. The MGRS standard states that "To facilitate machine-to-machine communication, an MGRS string is to have no intermediate spaces or punctuation The last 3 digits are the distance in meters measured from the southern grid line. Using a map with a 1000m grid, the first two digits are come from the large type on the label for the grid line to the south of the position. Measurement of North-South position, within the 100,000 meter square, in meters. The bottom set of numbers, 44683, represent a The last 3 digits are the distance in meters measured from the western grid line. Using a map with a 1000m grid, the first two digits are come from the large type on the label for the grid line to the west of the position. Measurement of East-West position, within the 100,000 meter square, in meters. The top set of numbers, 06832, represent a It identifies a unique 100,000m square within the Grid Zone. Necessary to make the coordinates unique over the entire globe. The 10S is the Grid Zone Designation you are in. The two grid lines are 1000 meters apart. , reads "seven hundred and six thousand meters East." The label, Look along the bottom edge of the map at the labels for the vertical grid lines. The vertical grid lines determine East-West position and the horizontal grid lines determine North-South Larger type numbers are replaced by the 100,000m Square ID. When using MGRS or USNG the small type numbers to the left of the The grid is labeled with UTM coordinate values.īut the same grid is used for both MGRS and USNG positions. The map has grid lines spaced every kilometer or 1000 meters. Set to display position in US National Grid format, would report a location of: Let's look at where the various parts of the MGRS position come from on the map. Standing at the center of the marker shown on the map below, a GPS unit
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