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U.S. National Grid

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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

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

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

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

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

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

up a grid coordinate.

17R LL 573 918

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

17R LL 573 918

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

17R LL 573 918

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

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

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

- 17R
- 17R NN
- NN
- 17938 01505

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

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

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

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

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

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

- 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

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