Radiobeacon System Map for North Atlantic (1978)

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Radiobeacon System
Most radiobeacons must share a group frequency with other beacons. Therefore, radiobeacons in the same general geographical area are divided into groups of up to six beacons transmitting on a single frequency with the sequence being repeated continually. Each radiobeacon transmits for at least one-minute out of each six-minute period in sequence with the other beacons of the group regardless of weather conditions. If less than six radiobeacons are assigned to a sequence group, one or more of the beacons may transmit during two of the six one-minute periods. Various colors are used to distinguish each group on the above map.
The SEQUENCE within a group is indicated by a Roman numeral; however, an asterisk character if the station transmits twice during the six one-minute. If neither a Roman numeral or an asterisk is shown, then the beacon transmits continuously and is marked as (always black).
SERVICE RANGE is shown in miles.
The FREQUENCY is in kilohertz.
CHARACTERISTIC IDENTIFICATION consists of a combination of dots and dashes. The characteristic signal of all beacons is superimposed on a continuous carrier when they are transmitting. The last ten seconds of the minute are devoted to a long dash for maximum bearing accuracy using manual operation.
Marker radiobeacons indicated by are of low power for local use only. They operate continuously on the frequency, transmitting a series of ½-second dashes.

Sequenced Radiobeacons

286 I Highland Lighthouse
HI ()
100 42 02 24 70 03 40
286 II Nantucket Shoals Lightship
NS ()
100 40 30 00 69 28 00
286 III Fire Island Lighthouse
RT ()
100 40 37 48 73 13 09
286 IV Ambrose Lighthouse
T ( etc.)
100 40 27 32 73 49 52
286 V Great Duck Island Lighthouse
GD ()
50 44 08 32 68 14 47
286 VI Execution Rocks Lighthouse
K ()
20 40 52 41 73 44 18
286 VI Manana Island Fog Signal
MI ()
100 43 45 48 69 19 38
298 II Five Fathom Lighted Horn Buoy F Buoy
UT ()
70 38 47 18 74 34 36
298 I Brandywine Shoals Lighthouse
OI ()
20 38 59 11 75 06 49
298 III Cape Henlopen Radiobeacon
HL ()
70 38 47 39 75 05 26
298 IV Cape Henry Lighthouse
K ()
150 36 55 35 76 00 27
298 V Delaware Lighted Horn Buoy D Buoy
RK ()
15 38 27 18 74 35 06
306 II Little Gull Island Lighthouse
J ()
20 41 12 22 72 06 29
306 VI Montauk Point Lighthouse
Y ()
20 41 04 15 71 51 27
308 II Partridge Island (Can.) Lighthouse
U ()
50 45 14 13 66 03 17
308 III Southwest Head (Can.) Lighthouse
N ()
50 44 36 03 66 54 20
308 IV West Quoddy Lighthouse
Y ()
20 44 48 54 66 57 04
308 VI Seal Island (Can.) Lighthouse
H ()
40 43 23 28 66 00 53

Continous Radiobeacons

290 Chesapeake Lighthouse
P ()
70 36 54 15 75 42 47
291 Halfway Rock Lighthouse
HR ()
10 43 39 21 70 02 15
291 Nobska Point Lighthouse
G ()
20 41 30 58 70 39 20
295 Brenton Reef Lighthouse
BR ()
10 41 25 35 71 23 22
295 Scituate Harbor Radiobeacon
SH ()
10 42 11 56 70 43 01
295 Stratford Shoal Lighthouse
P ()
20 41 03 36 73 06 06
301 Block Island Southeast Lighthouse
BI ()
20 41 09 09 71 33 07
301 Portland Lighted Horn Buoy P Lightship
PH ()
30 43 31 37 70 05 31
304 Boston Lighted Horn Buoy B Buoy
BH ()
30 42 22 42 70 47 00
308 Cleveland Ledge Lighthouse
C ()
10 41 37 51 70 41 42
308 Manasquan Inlet Radiobeacon
MI ()
20 40 06 03 74 02 03
310 Smith Point Lighthouse
SP ()
20 37 52 47 76 11 03
311 Chatham Lighthouse
CH ()
20 41 40 17 69 57 02
314 Buzzards Bay Entrance Lighthouse
L ()
20 41 23 47 71 02 02
314 Cove Point Lighthouse
W ()
20 38 23 10 76 22 55
314 Matinicus Rock Lighthouse
MR ()
20 43 47 01 68 51 19
317 Wolf Trap Lighthouse
WO ()
20 37 23 24 76 11 24
318 Cape Cod Canal Breakwater Lighthouse
U ()
20 41 46 28 70 29 50
320 Cuckolds Lighthouse
CU ()
10 43 46 46 69 39 02
322 Butler Flats Lighthouse
R ()
10 41 36 13 70 53 42
325 Brant Point Lighthouse
BP ()
10 41 17 23 70 05 27
325 Eastern Point Lighthouse
EP ()
10 42 34 50 70 39 54
325 Point Judith Lighthouse
PJ ()
10 41 21 39 71 28 55

Marker Radiobeacons

294 Ocean City Inlet Lighthouse 38 19 26 75 05 07
294 Sandy Hook Channel Approach Lighted Horn Buoy 2A Buoy 40 26 31 73 55 01
308 Indian River Inlet Radiobeacon 38 36 35 75 04 06
311 Shinnecock Lighthouse 40 50 32 72 28 44
316 Atlantic City Lighthouse 39 21 57 74 24 37
317 Jones Inlet Radiobeacon 40 34 50 73 34 24
320 Saybrook Breakwater Lighthouse 41 15 47 72 20 36
322 Barnegat Inlet Radiobeacon 39 45 28 74 06 21
324 Cape May Radiobeacon 38 56 38 74 52 20
324 Wachapreague Inlet Radiobeacon 37 34 24 75 37 30
326 Rockaway Lighthouse 40 33 07 73 56 22
Each marker radiobeacon transmits a series of ½-second dashes.