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Nationwide Differential GPS (NDGPS)
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DGPS SITE CONFIGURATION INFORMATION

Differential corrections are based on the NAD83 (2011) position of the reference station (REFSTA) antenna. Positions obtained using DGPS should be referenced to NAD 83 coordinate system only. All sites are broadcasting RTCM Type 9-3 correction messages. Please report DGPS problems or outages at our report-a-problem page. Thank you in advance.

Note: The following DGPS beacon signals were terminated on September 30, 2018.
  • Pigeon Point, CA (287 KHZ, Site ID 883)
  • Robinson Point, WA (323 KHZ, Site ID 887)
  • Annapolis, MD (301 KHZ, Site ID 847)
  • Bobo, MS (297 KHZ, Site ID 792)
  • New Bern, NC (294 KHZ, Site ID 771)
For inquiries, please contact the Navigation Information Service (NIS) via our Contact Us page or via phone at 703-313-5900.

The following is a list of the 33 Operational DGPS Sites.
Acushnet,MA
RBn Antenna Location:41 44.57 N, 070 53.19 W
REFSTA Ant Location (A):41 44.613282 N, 70 53.217112 W
REFSTA Ant Location (B):41 44.594605 N, 70 53.195335 W
REFSTA RTCM SC-104 ID (A):198
REFSTA RTCM SC-104 ID (B):199
Broadcast Site ID:772
Transmission Frequency:306 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 370KM

Angleton,TX
RBn Antenna Location:29 18.05 N, 095 29.04 W
REFSTA Ant Location (A):29 18.088229 N, 95 29.103959 W
REFSTA Ant Location (B):29 18.098420 N, 95 29.091636 W
REFSTA RTCM SC-104 ID (A):246
REFSTA RTCM SC-104 ID (B):247
Broadcast Site ID:828
Transmission Frequency:301 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 275KM

Annette Island,AK
RBn Antenna Location:55 04.10 N, 131 36.00 W
REFSTA Ant Location (A):55 04.144147 N, 131 35.970893 W
REFSTA Ant Location (B):55 04.132804 N, 131 35.951408 W
REFSTA RTCM SC-104 ID (A):278
REFSTA RTCM SC-104 ID (B):279
Broadcast Site ID:889
Transmission Frequency:323 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 315KM

Appleton,WA
RBn Antenna Location:45 46.91 N, 121 19.64 W
REFSTA Ant Location (A):45 46.957719 N, 121 19.652758 W
REFSTA Ant Location (B):45 46.957434 N, 121 19.634260 W
REFSTA RTCM SC-104 ID (A):172
REFSTA RTCM SC-104 ID (B):173
Broadcast Site ID:871
Transmission Frequency:300 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 402KM

Biorka,AK
RBn Antenna Location:56 51.28 N, 135 32.47 W
REFSTA Ant Location (A):56 51.269416 N, 135 32.356458 W
REFSTA Ant Location (B):56 51.258776 N, 135 32.373371 W
REFSTA RTCM SC-104 ID (A):280
REFSTA RTCM SC-104 ID (B):281
Broadcast Site ID:890
Transmission Frequency:305 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 315KM

Cape Canaveral,FL
RBn Antenna Location:28 27.62 N, 080 32.74 W
REFSTA Ant Location (A):28 27.613331 N, 080 32.713648 W
REFSTA Ant Location (B):28 27.597123 N, 080 32.728376 W
REFSTA RTCM SC-104 ID (A):18
REFSTA RTCM SC-104 ID (B):19
Broadcast Site ID:809
Transmission Frequency:289 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 371KM

Cape Mendocino,CA
RBn Antenna Location:40 26.51 N, 124 23.78 W
REFSTA Ant Location (A):40 26.506261 N, 124 23.779130 W
REFSTA Ant Location (B):40 26.484197 N, 124 23.778844 W
REFSTA RTCM SC-104 ID (A):270
REFSTA RTCM SC-104 ID (B):271
Broadcast Site ID:885
Transmission Frequency:292 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 333KM

Card Sound,FL
RBn Antenna Location:25 25.90 N, 080 27.98 W
REFSTA Ant Location (A):25 25.897326 N, 080 28.017391 W
REFSTA Ant Location (B):25 25.883042 N, 080 28.019642 W
REFSTA RTCM SC-104 ID (A):16
REFSTA RTCM SC-104 ID (B):17
Broadcast Site ID:808
Transmission Frequency:314 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 261KM

Cheboygan,MI
RBn Antenna Location:45 39.21 N, 084 27.92 W
REFSTA Ant Location (A):45 39.209100 N, 084 27.938327 W
REFSTA Ant Location (B):45 39.221343 N, 84 27.950260 W
REFSTA RTCM SC-104 ID (A):112
REFSTA RTCM SC-104 ID (B):113
Broadcast Site ID:836
Transmission Frequency:292 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 177KM

Detroit,MI
RBn Antenna Location:42 17.83 N, 083 05.71 W
REFSTA Ant Location (A):42 17.840411 N, 083 05.717475 W
REFSTA Ant Location (B):42 17.833636 N, 83 05.731678 W
REFSTA RTCM SC-104 ID (A):116
REFSTA RTCM SC-104 ID (B):117
Broadcast Site ID:838
Transmission Frequency:319 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 161KM

Driver,VA
RBn Antenna Location:36 57.48 N, 076 33.44 W
REFSTA Ant Location (A):36 57.518936 N, 76 33.398372 W
REFSTA Ant Location (B):36 57.509275 N, 76 33.386882 W
REFSTA RTCM SC-104 ID (A):12
REFSTA RTCM SC-104 ID (B):13
Broadcast Site ID:806
Transmission Frequency:289 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 241KM

English Turn,LA
RBn Antenna Location:29 52.7 N, 089 56.5 W
REFSTA Ant Location (A):29 52.737434 N, 89 56.503285 W
REFSTA Ant Location (B):29 52.750738 N, 89 56.524730 W
REFSTA RTCM SC-104 ID (A):28
REFSTA RTCM SC-104 ID (B):29
Broadcast Site ID:814
Transmission Frequency:293 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 315KM

Fort Stevens,OR
RBn Antenna Location:46 12.29 N, 123 57.36 W
REFSTA Ant Location (A):46 12.293029 N, 123 57.364639 W
REFSTA Ant Location (B):46 12.309538 N, 123 57.359693 W
REFSTA RTCM SC-104 ID (A):272
REFSTA RTCM SC-104 ID (B):273
Broadcast Site ID:886
Transmission Frequency:287 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 333KM

Gustavus,AK
RBn Antenna Location:58 24.96 N, 135 41.80 W
REFSTA Ant Location (A):58 25.049028 N, 135 41.839199 W
REFSTA Ant Location (B):58 25.065282 N, 135 41.821669 W
REFSTA RTCM SC-104 ID (A):284
REFSTA RTCM SC-104 ID (B):285
Broadcast Site ID:892
Transmission Frequency:288 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 315KM

Hudson Falls,NY
RBn Antenna Location:43 16.21 N, 073 32.31 W
REFSTA Ant Location (A):43 16.249032 N, 073 32.347046 W
REFSTA Ant Location (B):43 16.263693 N, 73 32.345305 W
REFSTA RTCM SC-104 ID (A):94
REFSTA RTCM SC-104 ID (B):95
Broadcast Site ID:844
Transmission Frequency:324 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 250KM

Kenai,AK
RBn Antenna Location:60 40.50 N, 151 21.01 W
REFSTA Ant Location (A):60 40.504714 N, 151 21.009469 W
REFSTA Ant Location (B):60 40.488269 N, 151 21.008384 W
REFSTA RTCM SC-104 ID (A):292
REFSTA RTCM SC-104 ID (B):293
Broadcast Site ID:896
Transmission Frequency:310 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 260KM

Kensington,SC
RBn Antenna Location:33 28.86 N, 079 20.58 W
REFSTA Ant Location (A):33 28.921436 N, 079 20.578943 W
REFSTA Ant Location (B):33 28.918634 N, 079 20.561947 W
REFSTA RTCM SC-104 ID (A):192
REFSTA RTCM SC-104 ID (B):193
Broadcast Site ID:778
Transmission Frequency:292 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 200KM

Kodiak,AK
RBn Antenna Location:57 37.1413 N, 152 11.6164 W
REFSTA Ant Location (A):57 37.061583 N, 152 11.604449 W
REFSTA Ant Location (B):57 37.055575 N, 152 11.631583 W
REFSTA RTCM SC-104 ID (A):294
REFSTA RTCM SC-104 ID (B):295
Broadcast Site ID:897
Transmission Frequency:313 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 333KM

Kokole Point,HI
RBn Antenna Location:21 59.03 N, 159 45.53 W
REFSTA Ant Location (A):21 59.009106 N, 159 45.488644 W
REFSTA Ant Location (B):21 59.025799 N, 159 45.493910 W
REFSTA RTCM SC-104 ID (A):260
REFSTA RTCM SC-104 ID (B):261
Broadcast Site ID:880
Transmission Frequency:300 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 210KM

Level Island,AK
RBn Antenna Location:56 28.01 N, 133 05.58 W
REFSTA Ant Location (A):56 27.940652 N, 133 05.565597 W
REFSTA Ant Location (B):56 27.939412 N, 133 05.541871 W
REFSTA RTCM SC-104 ID (A):282
REFSTA RTCM SC-104 ID (B):283
Broadcast Site ID:891
Transmission Frequency:295 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 315KM

Lincoln,CA
RBn Antenna Location:38 50.84 N, 121 21.04 W
REFSTA Ant Location (A):38 50.790445 N, 121 21.013231 W
REFSTA Ant Location (B):38 50.790265 N, 121 21.032115 W
REFSTA RTCM SC-104 ID (A):210
REFSTA RTCM SC-104 ID (B):211
Broadcast Site ID:764
Transmission Frequency:314 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 225KM

Mequon,WI
RBn Antenna Location:43 11.69 N, 088 03.59 W
REFSTA Ant Location (A):43 11.632700 N, 088 03.571635 W
REFSTA Ant Location (B):43 11.633031 N, 088 03.591775 W
REFSTA RTCM SC-104 ID (A):218
REFSTA RTCM SC-104 ID (B):219
Broadcast Site ID:777
Transmission Frequency:304 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 230KM

Moriches,NY
RBn Antenna Location:40 47.40 N, 072 44.83 W
REFSTA Ant Location (A):40 47.370983 N, 072 44.777310 W
REFSTA Ant Location (B):40 47.363766 N, 072 44.797802 W
REFSTA RTCM SC-104 ID (A):6
REFSTA RTCM SC-104 ID (B):7
Broadcast Site ID:803
Transmission Frequency:293 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 241KM

Penobscot,ME
RBn Antenna Location:44 27.10 N, 068 46.33 W
REFSTA Ant Location (A):44 27.102957 N, 068 46.336034 W
REFSTA Ant Location (B):44 27.120785 N, 068 46.332640 W
REFSTA RTCM SC-104 ID (A):44
REFSTA RTCM SC-104 ID (B):45
Broadcast Site ID:799
Transmission Frequency:290 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 435KM

Point Loma,CA
RBn Antenna Location:32 39.97 N, 117 14.6 W
REFSTA Ant Location (A):32 39.925066 N, 117 14.580992 W
REFSTA Ant Location (B):32 39.936817 N, 117 14.589884 W
REFSTA RTCM SC-104 ID (A):262
REFSTA RTCM SC-104 ID (B):263
Broadcast Site ID:881
Transmission Frequency:302 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 333KM

Potato Point,AK
RBn Antenna Location:61 03.4 N, 146 41.8 W
REFSTA Ant Location (A):61 03.375650 N, 146 41.808717 W
REFSTA Ant Location (B):61 03.378492 N, 146 41.840039 W
REFSTA RTCM SC-104 ID (A):290
REFSTA RTCM SC-104 ID (B):291
Broadcast Site ID:895
Transmission Frequency:298 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 185KM

Sandy Hook,NJ
RBn Antenna Location:40 28.29 N, 074 00.71 W
REFSTA Ant Location (A):40 28.289027 N, 074 00.695661 W
REFSTA Ant Location (B):40 28.290445 N, 074 00.711397 W
REFSTA RTCM SC-104 ID (A):8
REFSTA RTCM SC-104 ID (B):9
Broadcast Site ID:804
Transmission Frequency:286 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 185KM

Tampa (Macdill),FL
RBn Antenna Location:27 51.01 N, 082 31.95 W
REFSTA Ant Location (A):27 50.988979 N, 082 31.938923 W
REFSTA Ant Location (B):27 50.988962 N, 082 31.955334 W
REFSTA RTCM SC-104 ID (A):244
REFSTA RTCM SC-104 ID (B):245
Broadcast Site ID:827
Transmission Frequency:312 KHZ
Transmission Rate:200 BPS
Signal Strength:100uV at 389KM

Upolu Point,HI
RBn Antenna Location:20 14.85 N, 155 53.07 W
REFSTA Ant Location (A):20 14.752783 N, 155 53.027567 W
REFSTA Ant Location (B):20 14.771766 N, 155 53.012153 W
REFSTA RTCM SC-104 ID (A):258
REFSTA RTCM SC-104 ID (B):259
Broadcast Site ID:879
Transmission Frequency:286 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 315KM

Upper Keweenaw,MI
RBn Antenna Location:47 13.6 N, 088 37.4 W
REFSTA Ant Location (A):47 13.623429 N, 088 37.458985 W
REFSTA Ant Location (B):47 13.637471 N, 088 37.446240 W
REFSTA RTCM SC-104 ID (A):102
REFSTA RTCM SC-104 ID (B):103
Broadcast Site ID:831
Transmission Frequency:298 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 209KM

Whidbey Island,WA
RBn Antenna Location:48 18.8 N, 122 41.8 W
REFSTA Ant Location (A):48 18.762698 N, 122 41.767562 W
REFSTA Ant Location (B):48 18.746291 N, 122 41.767589 W
REFSTA RTCM SC-104 ID (A):276
REFSTA RTCM SC-104 ID (B):277
Broadcast Site ID:888
Transmission Frequency:302 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 166KM

Wisconsin Point,WI
RBn Antenna Location:46 42.32 N, 092 00.91 W
REFSTA Ant Location (A):46 42.302867 N, 092 00.912216 W
REFSTA Ant Location (B):46 42.306095 N, 092 00.935716 W
REFSTA RTCM SC-104 ID (A):100
REFSTA RTCM SC-104 ID (B):101
Broadcast Site ID:830
Transmission Frequency:296 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 270KM

Youngstown,NY
RBn Antenna Location:43 13.8 N, 078 58.2 W
REFSTA Ant Location (A):43 13.874804 N, 078 58.209905 W
REFSTA Ant Location (B):43 13.874655 N, 078 58.187767 W
REFSTA RTCM SC-104 ID (A):118
REFSTA RTCM SC-104 ID (B):119
Broadcast Site ID:839
Transmission Frequency:322 KHZ
Transmission Rate:100 BPS
Signal Strength:75uV at 241KM