LORAN-C Chains

Brooke Clarke, N6GCE


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.
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
3204'18.130"N
10652'04.388"W
40000
Y
Raymondville,
TX

26 31' 55.141"N
9749'59.539"W
52000
Z
Grangeville,
LA

3043'33.149"N
9049'59.539"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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