![]() Most UTM users and GPS (Global Positioning System) units use the full value of the UTM coordinates. Note that UTM coordinates get rounded, not truncated (unlike MGRS grid references). The military implementation of UTM (Military Grid Reference System or MGRS) drops the small digits and indicates the 100,000 meter square by a two letter identifier. The millions and hundreds of thousands of meters are shown with small numbers and are sometimes dropped when giving UTM coordinate positions. ![]() Note that the large numbers adjacent to the tick marks around the perimeter of the map represent tens of thousands and thousands of meters. Measurements can be made using a gridded mylar overlay, a paper scale, or a coordinate reader. The UTM system is not a single map projection. It is used to identify locations on the earth, but differs from the traditional method of latitude and longitude in several respects. This narrows down the coordinate to a 100 meter or 10 meter square. The Universal Transverse Mercator ( UTM) coordinate system is a grid-based method of specifying locations on the surface of the Earth. To make UTM measurements, subdivide the 1,000-meter grid squares into tenths or hundredths. ![]() Some maps, including all those produced after 2009 ( US Topo maps) include full UTM grid lines. Like the UTM coordinate system, the UPS coordinate system uses a metric-based cartesian grid laid out on a conformally projected surface. US Topo map showing latitude and longitude of the corner (38°N, -115.8750°W) and brown UTM gridlines (4,206,000 meters northing and 599,000 meters easting)Īlmost all USGS topographic maps produced after 1977 show UTM tick marks on the sides of the map (or a full-line grid) every 1,000 meters. The universal polar stereographic ( UPS) coordinate system is used in conjunction with the universal transverse Mercator (UTM) coordinate system to locate positions on the surface of the earth. ![]()
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