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April 20, 2006
Executive Summary
U.S. National Grid Supporting Public Safety, Commerce, and the General Public
Background. The Federal Geographic Data Committee’s U.S. National Grid (USNG) standard provides a nationally consistent language of location that has been optimized for local applications. • All street maps use a standard set of street names and addresses to locate places. The
USNG does not replace this practice; it supplements it. The USNG expands the utility of street, and other, maps by adding several powerful features: It provides a grid reference system that is seamless across jurisdictional boundaries; it provides the foundation for a universal map index; it describes point-locations on appropriately gridded paper and digital maps; it allows geopositioning using Global Positioning System (GPS) receivers; and it supports Worldwide Web map portals that link digital maps and GPS data.
• USNG may be the only unambiguous way to describe locations when the end-user is
operating either in an area away from an established road network, or in an area impacted by a natural disaster where road signs have been destroyed.
• Private citizens, public agencies, and commercial enterprises can use USNG. It has
obvious applications in navigation, public safety response (e.g., police, fire, rescue, National Guard), and web-enabled directions to businesses and other public/private facilities.
• USNG is a Presentation Standard. It does not replace data storage formats for either
Geographic Information Systems (GIS) or the State Plane Coordinate System (SPCS) for engineering and survey applications.
• USNG is an alpha-numeric point reference system that has been overlaid on the
Universal Transverse Mercator (UTM) numerical grid. Every modest size home in a discrete area can be described using 8-digits (e.g., 1234 5678). By adding a two-letter prefix (e.g., XX 1234 5678), the location is identified regionally (state-wide). This alpha-numeric designator can be used today with many consumer GPS receivers costing less than $100.
• The Army National Guard has been trained to use the USNG format. Additionally,
USNG and the Military Grid Reference (MGRS) values are identical when referenced to WGS 84 or NAD 83 datum; therefore, state National Guard units can integrate seamlessly with their federal counterparts when joint responses are warranted.
• Additional information: www.fgdc.gov/usng
- Grid lines are identified by Principal Digits.Ignore the small superscript numbers likethose in the lower left corner of this map.
Reading US National Grid (USNG) Coordinates: “Read right, then up.”
Ed: 20051227-USNGInstruct_No1v5
Grid: Examples: 228058 FDR Memorial: 231054 George Mason Memorial:2338 0710 Zero Milestone:2275 0628 DC War Memorial: 213017 Ft. Scott Park:
Reading USNG Grid Coordinates.- Coordinates are always given as an evennumber of digits (i.e. 23370651).
- Separate coordinates in half (2337 0651)into the easting and northing components.
- Read right to grid line 23. Then measureright another 370 meters. (Think 23.37)
- Read up to grid line 06. Then measureup another 510 meters. (Think 06.51)
1. 2.
3. 4.
4305
000m
N
06
07
322000mE 23 24USNG: 18S UJ
Grid: 2306
Read right to grid line 23.
Read up to grid line 06.
Measure up 510 meters.
370meters
Datum: NAD 83
0 1,000-m
1. 2.
3.
4.
The example below locates the Jefferson Pier at USNG: 18S UJ 23371 06519.
Grid Zone Designation (GZD): 6° x 8° longitude zone / latitude band.
100,000-m Square Identification:18S UJ 2337 0651
Grid Coordinates: Read right, then up.
Grid Zone Designation18S
43 00UH
UJ
100,000-m Square ID
U.S. National Grid
Some maps may givethis leading informationin a grid reference box.
A USNG value has three components.
Full USNG: 18S UJ 2337 0651 - World wide unique. Without Grid Zone Designation (GZD): UJ 2337 0651 - Regional areas.Without GZD and 100,000-m Square ID: 2337 0651 - Local areas.
A modest size home canbe found or identified in a local area
with only an 8-digit grid.
“Read right, then up.”
Ignore the small UTM superscript numbers that are provided for reference purposes.UTM numerical values are best suited for determining direction and distance as in surveying. USNG alpha-numeric values are best suited for describing particular locations because they can be given as only grid coordinates and with only the precision required for a particular task.
UTM format.
This illustrates how USNG coordinates can be used in a phone directory or advertisement like a universal map index value.Unlike classic atlas grids (i.e. B3), these can be used with any paper map using the national grid and in web map portals such as the Washington, DC GIS (http://dcgis.dc.gov) or The National Map. (http://nmviewogc.cr.usgs.gov/viewer.htm)They can also be used in consumer GPS receivers to directly guide you to the location. This is especially beneficial at night, in heavy traffic, orafter major disasters when street signs are missing.
Users determine the required precision.These values represent a point position
(southwest corner) for an area of refinement.
Four digits: 23 06 Locating a point within a 1,000-m square.Six digits: 233 065 Locating a point within a 100-m square (football field size).Eight digits: 2337 0651 Locating a point within a 10-m square (modest size home).Ten digits: 23371 06519 Locating a point within a 1-m square (parking space size).
Information Sheet 1 in this series. FGDC-STD-011-2001 From www.fgdc.gov/usng
Grid: 23370651
Point of Interest Street Address USNG Grid:18S UJ
Telephone:(202)
Subway Sandwich & SaladsSubway Sandwich & SaladsSubway Sandwich & SaladsSubway Sandwich & Salads
2030 M St., NW430 8th St., SE3504 12th St., NE
1500 Benning Rd, NE
2256 08262698 05672740 11202815 0757
223-2587547-8200526-5999388-0421
08/27/98
UTM/USNG Grid Zone Designations126° 120° 114° 108° 102° 96° 90° 84° 78° 72° 66°
10 11 12 13 14 15 16 17 18 1924°N
32°N
40°N
48°N
18S
S
R
U
T QD TJ
PC QC TH
PD
UH VH
UJ
NC
NBMBLBKB
KA LA MA NA PA
PB QB TG UG VG
QA TF UF VF
4300
4400
4200
400300
78°W
700600
500
4400
4300
U.S.National Grid100,000m Square Identification
4200
4100
4000
40 0300
70060 050 040 0300 40 0300
4100
4000
78°W
Grid Zone Designation18SGrid Zone Designation
17S
GZD: 18TGZD: 17T
GZD: 18SGZD: 17S
Jefferson Pier:18S UJ 2337 0652
US National Grid (USNG) Coordinates: World wide context.
The example below locates the Jefferson Pier at USNG: 18S UJ 23371 06519.
Grid Zone Designation (GZD): 6° x 8° longitude zone / latitude band.
100,000-m Square Identification:18S UJ 2337 0651
Grid Coordinates: Read right, then up.
Grid Zone Designation18S
43 00UH
UJ
100,000-m Square ID
U.S. National Grid
Some maps may givethis leading informationin a grid reference box.
A USNG value has three components.
“Read right, then up.”USNG values have three components as seen above. The GZD gives a USNG value world-widecontext with 60 longitudinal zones each 6° wide. Zones 10 - 19 cover the conterminous US as seen below left. Zones are divided into 8° latitudinal bands. Together these make up Grid Zone Designations (GZD). Example: 18S
GZDs are further subdivided into large squares with100,000-m Square Identifications. In this example,the Jefferson Pier is located in UJ. These squares areorganized and lettered so they do not repeatthemselves but every 18°, which is approximately1,000 miles in the mid-latitudes. The illustration atright depicts how far one must go before the letters UJrepeat. This ensures a given value such asUJ 2337 0651 is unique out of the entire state it islocated in, as well as all surrounding states.
The Power of Truncated USNG Values
Jefferson Pier, Washington, DCGrid: UJ23370651
= repeat of UJ23370651
Each 2 letter/8 digit USNG value(10-m posting) in the outlined area is unique.
In general, people can use the grid coordinates alone--for example: 233 065. Although the same numbers recursabout every 60 miles, normally that will cause no problem when the general location is understood. This is similar tothe way you would tell someone only the last digits of a phone number when the area code is obvious. If there is apossibility of confusion include the letter pair too--for example: UJ 233 065. A letter pair recurs about every 1000miles, so even in a disaster relief project there will be no other point with those coordinates in a local area. FullUSNG coordinates such as 18S UJ 233 065 are worldwide unique. Typically a GPS or other electronic devicerequires coordinates in that form since unlike a human it doesn't intuitively understand the general location fromcontext. You should always give full coordinates whenever abbreviated coordinates might not be clear or whenlisting them on letterhead, a business card or advertisement.
100,000-m Square IdentificationsExample: UJ
Information Sheet 2 in this series. FGDC-STD-011-2001 From www.fgdc.gov/usng
Ed: 20051227-USNGInstruct_No2v1
Example Points of Interest (POI) Map Index: Washington, DCEdition: December 28, 2005
Inclusion of any specific commercial POI in this example list does not imply endorsement by any government organization.1
This POI Map Index provided for demonstration purposes. Grid values obtained from Washington, DCGIS web site: dcatlas.dcgis.dc.gov/mar/
# Point of Interest Street Address USNG Grid:18S UJ
Telephone:(202)
1 National Geographic Society 1145 17th St., NW 2327 0823233082
857-7000
2 Armed Forces RetirementHome Building 5
Randolf St, NW 2546 1199
3 National Postal Museum 2 Massachusetts Ave., NE 2585 0739259074
633-5555
4 National Building Museum 401 F St., NW 2503 0736250074
272-2448
5 DC World War Memorial Independence Ave. SW 2276 0628
6 President Franklin DelanoRoosevelt
Pennsylvania Ave., NW 24502 06903
7 Subway Sandwich & Salads 3801 Nebraska Ave NW, Nebraska AveComplex, Bldg 14
1935 1213 362-8992
8 Subway Sandwich & Salads 5028 Wisconsin Ave NW 1947 1390 686-9870
9 Subway Sandwich & Salads(Per Subway web site.)
Federal Bldg #2, Box 2029, Food Court,Washington DC
204 042 (703)920-7916
10 Subway Sandwich & Salads 800 21st Street NW,Marvin Center Loading Dock
2247 0766 994-1801
11 Subway Sandwich & Salads 2033 K St NW 2255 0801 833-1363
12 Subway Sandwich & Salads 2030 M St NW 2256 0826 223-2587
13 Subway Sandwich & Salads 2010 P St NW 2265 0871 530-0698
14 Subway Sandwich & Salads 2469 18th St NW 2296 1013 667-2251
15 Subway Sandwich & Salads 1129 18th St NW 2298 0822 862-9840
16 Subway Sandwich & Salads 1776 G St NW 2299 0743 898-0520
17 Subway Sandwich & Salads 1666 K St NW 2327 0789 223-8720
18 Subway Sandwich & Salads 1444 I St NW 2373 0775 289-4301
19 Subway Sandwich & Salads 1401 K St NW 2377 0796 898-5784
20 Subway Sandwich & Salads 1100 New York Ave NW 2418 0771 289-7709
21 Subway Sandwich & Salads 1201 Tuckerman Street NW 2431 1513 291-7800
22 Subway Sandwich & Salads 709 H St., NW 2462 0762 842-2273
23 Subway Sandwich & Salads 406 1st St., SE 2604 0590 547-7827
24 Subway Sandwich & Salads 430 8th St., SE 2698 0567 547-8200
25 Subway Sandwich & Salads 3504 12th St NE 274 112 526-5999
26 Subway Sandwich & Salads 1213 Brentwood Rd NE 2752 0980 529-8206
27 Subway Sandwich & Salads 1412 Good Hope Rd SE 2781 0387 889-5888
28 Subway Sandwich & Salads 1500 Benning Rd NE, Hechinger Mall 2815 0757 388-042129 Subway Sandwich & Salads 3950 Minnesota Ave NE 3090 0687 398-3222
30 Subway Sandwich & Salads 4518 Benning Rd SE 3203 0624 575-2889
I-295
I-39
5
US-1-ALT
GW PKY
I-66
US-29
US-1
SW FWY
WHITEHURST FWY
I-395
NEW YORK AVE NW
11TH ST BR
G
SE FWY
US-50
GW
PK
Y
VA
-110
GE
OR
GE
WA
SH
ING
TO
N M
EM
OR
IAL P
KY
US-29
LEE HWY
JEFF. DA
VIS HW
Y
HENRY G SHIRLEY MEMORIAL HWY
U
S-1
US-50
US-29
13T
H S
T N
W
S C
AP
ITO
L S
T S
E
R ST NW
M ST NW
C ST NE
S C
AP
ITO
L S
T S
W2
H ST NE
SOUTHERN AVE
WIS
CO
NS
IN A
VE
NW
7TH
ST
NW
SOUTHERN AVE S
E
6TH
ST
NE
6TH
ST
NW
M ST SE
13T
H S
T N
E
ALABAMA AVE SE
MIC
HIGAN A
VE NE
4TH
ST
NE
U ST NW
Q ST NW
PARK RD NW
MASSACHUSETTS AVE NW
11T
H S
T S
E
4TH
ST
SE
9TH
ST
NW
FO
XH
AL
L RD
NW
TAYLOR ST NE
34T
H S
T N
W
MONROE ST NE
14T
H S
T N
W
11T
H S
T N
E
MAR
TIN
LU
THER
KIN
G J
R A
VE S
E
MACOMB ST NW
FRANKLIN ST NE
INDEPENDENCE AVE SE
17T
H S
T N
W
E ST NW
CONSTITUTION AVE NW
I ST SE
3A6T
H S
T S
E
3RD
ST
NW
GOOD HOPE RD SE
7TH
ST
SW
VIRGINIA AVE NW
37T
H S
T N
W
BENNING RD NE19T
H S
T N
W
3B
W ST NW
GE
OR
GIA
AV
E N
W
RO
CK
CR
EE
K P
KY
NW
RESERVOIR RD NW
9TH
ST
SW
HARVARD ST NW
WH
EE
LER
RD
SE
13T
H S
T S
E
LOUGHBORO RD NW
D ST SE
CALVERT ST NW
PA
RK
PL N
W
BRYANT ST NWRHODE ISLAND AVE NE
BE
AC
H D
R N
WH ST NW
ARIZONA A
VE NW
22N
D S
T N
W
K ST NW
MACARTHUR BLVD NW
SPRING RD NW
MT OLIVET RD NE
TUN
LAW
RD
NW
N C
AP
ITO
L S
T N
W
M ST SW
23R
D S
T N
W
NE
W JE
RS
EY
AV
E S
E
WA
RD
ER
ST
NW
NEB
RAS
KA A
VE N
W
OH
IO D
R S
W
2ND
ST
NE
NE
W M
EX
ICO
AV
E N
W
DA
LEC
AR
LA P
KY
NW
8TH
ST
SE
MONTANA AVE NE
MARYLAND AVE NE
CLEVELAND AVE NW
9TH
ST
SE
MALCOLM X AVE SE
29T
H S
T N
W
IRVING ST NW
FLORIDA AVE NW
TEN
NES
SEE
AVE
NE
SH
ER
MA
N A
VE
NW
14T
H S
T S
W
KAN
SAS
AVE
NW
MAINE AVE SW
GARFIELD ST NW
BRENTWOO
D RD N
E
TAFT
BR
G
D ST SW
19T
H S
T S
E
24T
H S
T N
W MICHIGAN AVE NW
L ST NW
KENTU
CKY
AVE SE
PORTER ST NW
IRVING ST NE
7TH
ST
SE
5TH
ST
SE
15T
H S
T N
W
KLINGLE RD NW
FORT DR NE
D ST NW
ILLINO
IS A
VE
NW
QUEBEC PL NW
NEW YORK AVE NW
NORTH CAROLINA AVE NE
INDEPENDENCE AVE SW
RHODE ISLAND AVE NW
MASSACHUSETTS AVE NE
T ST NW
SH
ER
IDA
N R
D S
E
2ND
ST
SE
POTOMAC AVE SE
VE
RM
ON
T A
VE
NW
17T
H S
T S
W
SPRING PL NW
12T
H S
T S
W
2ND
ST
NW
2ND
ST
SW
QUE ST NW
15T
H S
T S
W
POTOMAC AVE SE
Q ST NW
2
IRVING ST NW
E CAPITOL ST NE
13T
H S
T N
E
3A
FLORIDA AVE NW
PENNSYLVANIA AVE SE
E ST NW
FLORIDA AVE NW
PARK RD NW
13T
H S
T S
E
VE
RM
ON
T A
VE
NW
E CAPITOL ST NE
NEW H
AMPS
HIRE
AVE N
W
3B
VA-120
VA-2
7
98B 9B
5
RU
SS
ELL R
D
MT
VE
RN
ON
AV
E
8A
72
S GLEBE RDN
QU
INC
Y S
T
2ND ST S
WILSON BLVD
LORCOM LN
VA
LLEY
DR
SEMINARY RD
W GLEBE RD
23RD ST S
6
CLARENDON BLVD
10TH ST N
7A
N FAIRFAX DR
JEF
FE
RS
ON
DA
VIS
HW
Y
VA
-110
N PERSHING DR
7
GE
OR
GE
WA
SH
ING
TO
N M
EM
OR
IAL
PK
Y
VA-233
S FOUR M
ILE RUN DR
SPOUT RUN PKY
S A
RLI
NG
TO
N R
IDG
E R
D 15TH ST S
N R
HO
DE
S S
T
N L
YN
N S
T
WASHINGTON BLVD
N JA
CK
SO
N S
T
E GLEBE RD
N V
EIT
CH
ST
N KIRKWOOD RDKEY BLVD
S S
HIR
LING
TO
N R
D
21ST ST N
S H
AY
ES
ST
S WALTER REED DR
S F
ILLMO
RE
ST
NELLY CUSTIS DR
N D
AN
VILLE
ST
KE
NW
OO
D A
VE
7B
MEMORIAL DR
10A-B
LEE HWY
GW
PK
Y
GUNSTON RD
FAIRFAX DR
PENTAGON
NATIONAL-REAGAN NATIONAL AIRPORT
PO
TOM
AC
RIV
ER
ANACOSTIA
RIV
ER
TIDAL BASIN
ROCK CREEK
REFLECTING POOL REFLECTING POOL
18 19 20 21 22 23 24 25 26 27 28
00
01
02
03
04
05
06
07
08
09
10
11
12
318000m.E
318000m.E
19
19
320
320
21
21
22
22
23
23
24
24
25
25
26
26
27
27
328000m.E
328000m.E
4300
000m
. N
4300
000m
. N
01 01
02 02
03 03
04 04
05 05
06 06
07 07
08 08
09 09
4310 4310
11 11
4312
000m
. N
4312
000m
. N
Washington, DC
Jefferson Pier in Washington, DC18S UJ 2337 0652
1000-meter grid, US National GridNorth American Datum 1983Grid Zone Designation 18S100,000-m Square Identifcation: UJ, UH
Scale:1:24,000 (printed size: 21 x 27 inches)1:61,000 (printed size: 8.5 X11 inches)
(USNG Demonstration Map)
1,000 0 1,000 2,000 3,000 4,000500
Meters
Road Data Copyright (c) 2005 NavteqSource:NGA (CSAT), St. Louis, MO
National Geospatial-Intelligence AgencyCoordinate Systems Analysis Team (CSAT, SNAC)
St. Louis, MO314.263.4171
For additional Information:see www.fgdc.gov/usng/index.html
Washington,DC_USNG_Demo_V3
77º 6' 31" W
38º 56' 22" N
77º 6' 19" W
38º 49' 22" N
76º 58' 47" W
38º 56' 31" N
38º 49' 31" N
76º 58' 36" WGN
Grid Convergence1º 17' (23 mils)
2006 G-M Angle9º 30' W (169 mils)
To convert a gridazimuth to a magneticazimuth add G-M angle.
To convert a magneticazimuth to a gridazimuth subtract G-M angle.
UH
UJ UJ
UH
U.S. National Grid
100,000-m Square ID
UJ
4300
UH
Grid Zone Designation
18S
90 00 10 20 30 40 50 60
60
70
80
90
00
10
20
30
40
50
290000m.E
290000m.E
300
300
310
310
320
320
330
330
340
340
350
350
360000m.E
360000m.E
4260
000m
. N
4260
000m
. N4270 4270
4280 4280
4290 4290
4300 4300
4310 4310
4320 4320
4330 4330
4340 4340
4350
000m
. N
4350
000m
. N
THTJ
UHUJ
TH
TJ
Scale:1:500,000
U.S. National Grid
100,000-m Square ID 300
TJ UJ 4300 TH UH
Grid Zone Designation
18S
10,000-m GRID, US NATIONAL GRIDNORTH AMERICAN DATUM 1983GRID ZONE DESIGNATION: 18S100,000-m SQUARE IDENTIFICATIONS:TJ, UJ, TH, UH
ROAD DATA COPYRIGHT (c) 2005 NavteqSOURCE NGA (CSAT), ST. LOUIS, MO
For additional information:see www.fgdc.gov\usng\index.html
38º 25' 49" N
77º 30' 17" W
38º 26' 50" N
76º 30' 47" W
TJ UJ
TH UH
WASHINGTON, DC and VICINITYUSNG Demonstration Map
UH
UJ
39º 22' 33" N
76º 31' 58" W
39º 21' 31" N
77º 32' 18" W
Baltimore
Baltimore-WashingtonInt. Airport
Washington, DC
Washington-DullesInt. Airport
R. Reagan-WashingtonNatl. Airport
10,000 0 10,000 20,000 30,000 40,000Meters
10 0 10 205Miles
Maryland
Virginia
Potomac
River
2005G-M ANGLE
9º 30'W (169 MILS)
GRID CONVERGENCE1º 1'E (18 MILS)
GN
TO CONVERT A GRIDAZIMUTH TO A MAGNETICAZIMUTH ADD G-M ANGLE
TO CONVERT A MAGNETICAZIMUTH TO A GRID AZIMUTHSUBTRACT G-M ANGLE
