The United States National Grid is a nonproprietary alphanumeric referencing system derived from the Military Grid Reference System (MGRS) that is being promoted to increase the interoperability of location services appliances with printed map products by providing a nationally consistent grid reference system. The expanding use of portable GPS-enabled devices, public safety access points (PSAP)-enhanced cell phones, and automated vehicle location (AVL) technology has increased the need for accurate and consistent identification, communication, and mapping of ground coordinates. DHS recognizes that many different coordinate systems can be used to reference incident events in time and space. In 2005, the Department of Homeland Security (DHS) recommended that any DHS grant submission reference the use of a nationally defined coordinate system for all spatial referencing, mapping, and reporting. Introducing the United States National Grid
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