LORAN-C Chains

©Brooke Clarke, N6GCE 2002 - 2024

The LORAN-C system was shut down in 2010. US Coast Guard Special Notice.
LORAN-C stations (Wiki) are arranged in groups of 3 to 5 transmitting stations. They all transmit on a frequency of 100 kHz. In order to seperate one group of stations (called a chain) for another neighboring chain the time from when the master station transmits until it transmits again is different for each chain. This time is called the Group Repetition Interval (in uS). If you have a pulse generator that outputs pulses that are separated by this time interval and you use it to trigger a scope X axis (time axis) and you look at the output of a receiver tuned to 100 kHz you will see some pulses that are stable and also there will be other pulses that are not synchronized.

Following is a table of LORAN-C stations. For the X, Y, and Z slave stations the location name, Latitude, Longitude and coding delay in uS is shown.

The links attached to the city, state are to Google satellite images.
LORAN-C antennas (monopole towers) were typically 625 or 1350 ft in height. The Middletown, CA tower may is made up of 7 red and white sections each of which may be either 90 feet or 192 feet high. The Searchlight, NV station is made up of four towers each 625 Feet tall.

The F-4D (F-4.nl) used in Vietnam to drop sensors was equiped with the AN/APN-92 LORAN-C receiver and after fixing the start-up bugs, had a good reputation for accuracy. See Sonobuoy Ref 11 "Wiring Vietnam".

Also see my LORAN patents web page, Austron 2100F & 2100T, Austron 2042 LORAN-C Simulator, Lorchron LORAN-C Timing Receiver LFT-504,
Micrologic SportNav Loran-C Receiver with MGRS, R-1897/PSN-6 Loran Receiver, TI 9100 LORAN-C Receiver Type III,

YouTube: INFOAGE MUSEUM Military Electronics-APN-9 Loran Navigation -

Chain GRI Master Slave 1 Slave 2 Slave 3 Slave 4 Slave 5

Canadian
E Coast 5930 Caribou, ME
46° 48' 27.305"N
67° 55' 37.159"W X
Nantucket, MA
41° 15' 12.046"N
069° 58' 38.536"W
11000 Y
Cape Race, Newfoundland
46° 46' 32.286"N
53° 10' 27.606"W
25000 Z
Fox Harbor, Newfoundland
52° 22' 35.252"N
55° 42' 27.862"W
38000 na na

Russian
American 5980 Petropavlovsk,
Kamchatka
53° 07' 47.584"N
157° 41'42.900"E X
Attu, Attu Island,
AK
52° 49' 44.134"N
173° 10' 49.528"E
11000 Y
Alexandrovsk,
Sakhalen Island
51° 04' 42.80"N
142° 42' 04.95"E
28000 na na na

Canadian
W Coast 5990 Williams Lake,
BC
51° 57' 58.876"N
122° 22' 01.686"W X
Shoal Cove, AK
55° 26' 20.940"N
131° 15' 19.094"W
11000 Y
George, WA
47° 03' 48.096"N
119° 44' 38.976"W
27000 Z
Port Hardy, B.C.
50° 36' 29.830"N
127° 21' 28.489"W
41000 na na

Newfound-
land
E Coast 7270 Comfort Cove,
Newfoundland
49° 19' 53.57"N
54° 51' 42.57"W W
Cape Race, Newfoundland
46° 46' 32.286"N
53° 10' 27.606"W
11000 X
Fox Harbor, Newfoundland
52° 22' 35.252"N
55° 42' 27.862"W
25000 na na na

Gulf
of
Alaska 7960 Tok, AK
63° 19' 42.884"N
142° 48' 31.346"W X
Kodiak,
Narrow Cape
57° 26' 20.30"N
152° 22' 10.65"W
11000 Y
Shoal Cove, AK
55° 26' 20.940"N
131° 15' 19.094"W
26000 Z
Port Clarence, AK
65° 14' 40.372"N
166° 53' 11.996"W
45000 na na

S. E. U.S. 7980 Malone, FL
30° 59' 38.870"N
85° 10' 08.751"W W
Grangeville,
LA
30° 43' 33.149"N
90° 49' 59.539"W
11000 X
Raymondville,
TX
26° 31' 55.141"N
97° 49' 59.539"W
23000 Y
Jupiter, FL
27° 01' 58.63"N
80° 06' 52.97"W
43000 Z
Carolina Beach,
NC
34° 03' 46.17"N
77° 54' 46.21"W
59000 na

N
. Central
U.S. 8290 Havre, MT
48° 44' 38.589"N
109° 58' 53.613"W W
Baudette, MN
48° 36' 49.947"N
94° 33' 17.915"W
11000 X
Gillette, WY
44° 00' 11.305"N
105° 37' 23.895"W
27000 Y
Williams Lake, BC
51° 57' 58.876"N
122° 22' 01.686"W
42000 na na

Great Lakes 8970 Dana, IN
39° 51' 07.658"N
87° 29' 11.586"W W
Malone, FL
30° 59' 38.870"N
85° 10' 08.751"W
11000 X
Seneca, NY
42° 42' 50.716"N
76° 49' 33.308"W
28000 W
Baudette, MN
48° 36' 49.947"N
94° 33' 17.915"W
44000 Z
Boise City, OK
36° 30' 20.783"N
102° 53' 59.487"W
59000 na

S.
Central
U.S. 9610 Boise City, OK
36° 30' 20.783"N
102° 53' 59.487"W V
Gillette, WY
44° 00' 11.305"N
105° 37' 23.895"W
11000 W
Searchlight, NV
35° 19' 18.305"N
114° 48' 16.881"W
25000 X
Las Cruces, NM
32°04'18.130"N
106°52'04.388"W
40000 Y
Raymondville,
TX
26° 31' 55.141"N
97°49'59.539"W
52000 Z
Grangeville,
LA
30°43'33.149"N
90°49'59.539"W
65000

W. U.S. 9940 Fallon, NV
39° 33' 06.740"N
118° 49 55.816"W W
George, WA
47° 03' 48.096"N
119° 44' 38.976"W
11000 X
Middletown, CA
38° 46' 57.110"N
122° 29' 43.976"W
27000 Y
Searchlight, NV
35° 19' 18.305"N
114° 48' 16.881"W
40000 na na

N.E. U.S. 9960 Seneca, NY
42° 42' 50.716"N
76° 49' 33.308"W W
Caribou, ME
46° 48' 27.305"N
67° 55' 37.159"W
11000 X
Nantucket, MA
41° 15' 12.046"N
069° 58' 38.536"W
25000 Y
Carolina Beach,
NC
34° 03' 46.17"N
77° 54' 46.21"W
39000 Z
Dana, IN
39° 51' 07.658"N
87° 29' 11.586"W na

N. Pacific 9990 St Paul, Pribilof
Island, AK
57° 09' 12.350"N
170° 15' 06.245"W X
Attu, Attu Island,
AK
52° 49' 44.134"N
173° 10' 49.528"E
11000 Y
Port Clarence, AK
65° 14' 40.372"N
166° 53' 11.996"W
29000 Z
Kodiak,
Narrow Cape
57° 26' 20.30"N
152° 22' 10.65"W
43000 na na

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Page created: 16 June 2002.

Chain	GRI	Master	Slave 1	Slave 2	Slave 3	Slave 4	Slave 5
Canadian E Coast	5930	Caribou, ME 46° 48' 27.305"N 67° 55' 37.159"W	X Nantucket, MA 41° 15' 12.046"N 069° 58' 38.536"W 11000	Y Cape Race, Newfoundland 46° 46' 32.286"N 53° 10' 27.606"W 25000	Z Fox Harbor, Newfoundland 52° 22' 35.252"N 55° 42' 27.862"W 38000	na	na
Russian American	5980	Petropavlovsk, Kamchatka 53° 07' 47.584"N 157° 41'42.900"E	X Attu, Attu Island, AK 52° 49' 44.134"N 173° 10' 49.528"E 11000	Y Alexandrovsk, Sakhalen Island 51° 04' 42.80"N 142° 42' 04.95"E 28000	na	na	na
Canadian W Coast	5990	Williams Lake, BC 51° 57' 58.876"N 122° 22' 01.686"W	X Shoal Cove, AK 55° 26' 20.940"N 131° 15' 19.094"W 11000	Y George, WA 47° 03' 48.096"N 119° 44' 38.976"W 27000	Z Port Hardy, B.C. 50° 36' 29.830"N 127° 21' 28.489"W 41000	na	na
Newfound- land E Coast	7270	Comfort Cove, Newfoundland 49° 19' 53.57"N 54° 51' 42.57"W	W Cape Race, Newfoundland 46° 46' 32.286"N 53° 10' 27.606"W 11000	X Fox Harbor, Newfoundland 52° 22' 35.252"N 55° 42' 27.862"W 25000	na	na	na
Gulf of Alaska	7960	Tok, AK 63° 19' 42.884"N 142° 48' 31.346"W	X Kodiak, Narrow Cape 57° 26' 20.30"N 152° 22' 10.65"W 11000	Y Shoal Cove, AK 55° 26' 20.940"N 131° 15' 19.094"W 26000	Z Port Clarence, AK 65° 14' 40.372"N 166° 53' 11.996"W 45000	na	na
S. E. U.S.	7980	Malone, FL 30° 59' 38.870"N 85° 10' 08.751"W	W Grangeville, LA 30° 43' 33.149"N 90° 49' 59.539"W 11000	X Raymondville, TX 26° 31' 55.141"N 97° 49' 59.539"W 23000	Y Jupiter, FL 27° 01' 58.63"N 80° 06' 52.97"W 43000	Z Carolina Beach, NC 34° 03' 46.17"N 77° 54' 46.21"W 59000	na
N . Central U.S.	8290	Havre, MT 48° 44' 38.589"N 109° 58' 53.613"W	W Baudette, MN 48° 36' 49.947"N 94° 33' 17.915"W 11000	X Gillette, WY 44° 00' 11.305"N 105° 37' 23.895"W 27000	Y Williams Lake, BC 51° 57' 58.876"N 122° 22' 01.686"W 42000	na	na
Great Lakes	8970	Dana, IN 39° 51' 07.658"N 87° 29' 11.586"W	W Malone, FL 30° 59' 38.870"N 85° 10' 08.751"W 11000	X Seneca, NY 42° 42' 50.716"N 76° 49' 33.308"W 28000	W Baudette, MN 48° 36' 49.947"N 94° 33' 17.915"W 44000	Z Boise City, OK 36° 30' 20.783"N 102° 53' 59.487"W 59000	na
S. Central U.S.	9610	Boise City, OK 36° 30' 20.783"N 102° 53' 59.487"W	V Gillette, WY 44° 00' 11.305"N 105° 37' 23.895"W 11000	W Searchlight, NV 35° 19' 18.305"N 114° 48' 16.881"W 25000	X Las Cruces, NM 32°04'18.130"N 106°52'04.388"W 40000	Y Raymondville, TX 26° 31' 55.141"N 97°49'59.539"W 52000	Z Grangeville, LA 30°43'33.149"N 90°49'59.539"W 65000
W. U.S.	9940	Fallon, NV 39° 33' 06.740"N 118° 49 55.816"W	W George, WA 47° 03' 48.096"N 119° 44' 38.976"W 11000	X Middletown, CA 38° 46' 57.110"N 122° 29' 43.976"W 27000	Y Searchlight, NV 35° 19' 18.305"N 114° 48' 16.881"W 40000	na	na
N.E. U.S.	9960	Seneca, NY 42° 42' 50.716"N 76° 49' 33.308"W	W Caribou, ME 46° 48' 27.305"N 67° 55' 37.159"W 11000	X Nantucket, MA 41° 15' 12.046"N 069° 58' 38.536"W 25000	Y Carolina Beach, NC 34° 03' 46.17"N 77° 54' 46.21"W 39000	Z Dana, IN 39° 51' 07.658"N 87° 29' 11.586"W	na
N. Pacific	9990	St Paul, Pribilof Island, AK 57° 09' 12.350"N 170° 15' 06.245"W	X Attu, Attu Island, AK 52° 49' 44.134"N 173° 10' 49.528"E 11000	Y Port Clarence, AK 65° 14' 40.372"N 166° 53' 11.996"W 29000	Z Kodiak, Narrow Cape 57° 26' 20.30"N 152° 22' 10.65"W 43000	na	na