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U.S. National Grid. Objectives. In this lesson you will learn how to: Understand and read USNG coordinates Identify locations by using grid coordinates Relay grid coordinates in reference to a given location. Background.

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U.S. National Grid

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U s national grid l.jpg

U.S. National Grid


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Objectives

In this lesson you will learn how to:

  • Understand and read USNG coordinates

  • Identify locations by usinggrid coordinates

  • Relay grid coordinates in reference to a given location


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Background

The USNG ensures a uniform grid mapping system across cities and counties in Florida and can be easily extended world-wide as a grid reference system.

Additional information about the USNG can be found at:

www.fgdc.gov/usng


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Features of the USNG

USNG expands the utility of street and other mapsby adding the following commanding features:

  • Provides a grid reference system that is seamless across jurisdictional boundaries

  • Is the foundation for a universal map index

  • Describes point locations on appropriately gridded paper and digital maps

  • Allows geo-positioning using Global Positioning System (GPS) receivers

  • Supports World Wide Web map portals that link digital maps and GPS data


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Longitude and Latitude

Using longitude and latitude can be confusing because different agencies cite different coordinates to identify the same location.

All of the longitude and latitude coordinatesbelow describe the same location:

  • DD -85.990151, 30.272240

  • DM -85 59.409089, 30.16.334386

  • DMS 85 59’24.545”W, 30 16’20.063”N


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USNG Overlay

As a responder, you may be given a map or an aerial photograph of the response area with a USNG overlay.


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USNG Coordinates

The first step in reading a USNG map is to understand the letters and numbers that make

up a grid coordinate.


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Grid Zone Designation

17R LL 573 918

The 17R is the Grid Zone Designation (GZD) for aworld-wide unique address.


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Meter Square Identification

17R LL 573 918

The LL is the 100,000 Meter Square Identification for regional areas.


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Easting and NorthingGrid Coordinates

17R LL 573 918

The numbers 573 918 are the Easting and Northing coordinates of a specific location.


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Easting and NorthingNumber of Digits

The more digits used, the smaller the grid coordinates and the more accurate the location.

  • 57323 91820 10 digits locates the area within a1 x 1 meter square

  • 5732 9182 8 digits locates the area within a10 x 10 meter square

  • 573 9186 digits locates the area within a100 x 100 meter square

  • 57 914 digits locates the area within a1000 x 1000 meter square


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Knowledge Check

Given the coordinates 17R NN 17938 01505 what is the 100,000 Meter Square Identification for regional areas?

  • 17R

  • 17R NN

  • NN

  • 17938 01505


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Knowledge Check

You are responding to an area flooded by the storm surge during Hurricane Michael, and were given the coordinates 6612 5811. What size area will you be able to locate with these coordinates?

  • 1 x 1 meters

  • 10 x 10 meters

  • 100 x 100 meters

  • 1000 x 1000 meters


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Area Identified with a USNG Coordinate


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Knowledge Check

You are given the coordinates of a rescue team on-scene as 507 030. Find and mark this location on the map.


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Knowledge Check (Answer)‏

You are given the coordinates of a rescue team on-scene as 507 030. Find and mark this location on the map.


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Identifying the Coordinatesof a Known Location


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Knowledge Check

This map is labeled with points A and B. Identify the coordinates for the location of Point A, your location.

  • 572 914

  • 571 913

  • 913 571

  • 914 572


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Knowledge Check (Answer)‏

This map is labeled with points A and B. Identify the coordinates for the location of Point A, your location.

  • 572 914

  • 571 913

  • 913 571

  • 914 572


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Knowledge Check

A nearby rescue crew has located additional victims needing immediate attention. Your crew has been asked to report to the other crew’s location at Point B. Identify the coordinates in which you’ve been asked to report.

  • 578 915

  • 578 921

  • 917 578

  • 577 917


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Knowledge Check (Answer)‏

  • A nearby rescue crew has located additional victims needing immediate attention. Your crew has been asked to report to the other crew’s location at Point B. Identify the coordinates in which you’ve been asked to report.

    • 578 915

    • 578 921

    • 917 578

    • 577 917


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Summary

In this lesson, you have learned:

  • Why the U.S. National Grid (USNG) was developed

  • How to find a location withina devastated area if giventhe USNG coordinate

  • How to read a USNG to find and relay the grid coordinate for a location


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