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100,000-meter (100 km) Square Identification for regional areas.This consists of up to 2 digits (6-degree longitude UTM zone) for West to East, followed by a letter (8-degree latitude band) from South to North in this example, " 18S". Grid Zone Designation (GZD) for a world-wide unique address.USNG Grid Coordinates: "Read right, then up" as actual distances (locally, within a 100 km square) It consists of three parts (each of which follows a "read-right-then-up" paradigm familiar with other "X,Y" coordinates):
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This full form (15 characters) uniquely identifies a single one-meter grid square out of the entire surface of the earth. (This example used by the FGDC is the full one-meter grid reference of the Jefferson Pier in Washington DC.)
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Briefly, an example of a full USNG spatial address (grid reference) is: A number of brief tutorial references explain the system in detail, with examples. The USNG is an alpha-numeric reference system that overlays the UTM coordinate system. It has found increasing acceptance especially in emergency management, search and rescue, and other public safety applications yet, its utility is by no means limited to those fields. It can be applied to printed maps and to computer mapping and other (GIS) applications. The USNG is intended to supplement-not to replace-other location systems such as street addresses. It is also designed to be both flexible and scalable so that location references are as compact and concise as possible. It is intended to provide a frame of reference for describing and communicating locations that is easier to use than latitude/longitude for many practical applications, works across jurisdictional boundaries, and is simple to learn, teach, and use. The goal of the USNG is to provide a uniform, nationally-consistent rectangular grid system that is interoperable across maps at different scales, as well as with GPS and other location based systems. However, these grids, if non-standard or proprietary (such as so-called "bingo" grids with references such as "B-4"), are typically not interoperable with each other, nor can they usually be used with GPS. Paper maps often are published with overlaid rectangular (as opposed to latitude/longitude) grids to provide a reference to identify locations. This can improve human comprehension by providing reference of scale, as well as making actual distance computations more efficient. As such, they are often better served by a local Cartesian coordinate system, in which the coordinates represent actual distance units on the ground, using the same units of measurement from two perpendicular coordinate axes. While latitude and longitude are well suited to describing locations over large areas of the Earth's surface, most practical land navigation situations occur within much smaller, local areas.