Radiobeacon System Map for North Atlantic (1977)

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 or a coded Morse character.

Sequenced Radiobeacons

286 I Ambrose Lighthouse
T ( etc.)
100 40 27 32 73 49 52
286 II Fire Island Lighthouse
RT ()
100 40 37 48 73 13 09
286 V Block Island Southeast Lighthouse
F ()
70 41 09 09 71 33 07
286 VI Execution Rocks Lighthouse
K ()
20 40 52 41 73 44 18
298 I Brandywine Shoals Lighthouse
OI ()
20 38 59 11 75 06 49
298 II Five Fathom Lighted Horn Buoy F Buoy
UT ()
15 38 47 18 74 34 36
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
302 I Highland Lighthouse
Q ()
150 42 02 24 70 03 40
302 II Nantucket Shoals Lightship
OT ()
100 40 30 00 69 28 00
302 IV Chatham Lighthouse
NO ()
50 41 40 17 69 57 02
302 V Buzzards Bay Entrance Lighthouse
L ()
75 41 23 47 71 02 02
302 VI Boston Lighted Horn Buoy B Buoy
BH ()
60 42 22 42 70 47 00
304 IV Smith Point Lighthouse
X ()
20 37 52 47 76 11 03
304 V Wolf Trap Lighthouse
Z ()
20 37 23 24 76 11 24
304 VI Cove Point Lighthouse
W ()
20 38 23 10 76 22 55
306 II Little Gull Island Lighthouse
J ()
20 41 12 22 72 06 29
306 III Faulkner's Island Lighthouse
L ()
20 41 12 42 72 39 15
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
314 I Mount Desert Lighthouse
B ()
20 43 58 07 68 07 44
314 II Matinicus Rock Lighthouse
P ()
20 43 47 01 68 51 19
314 III Manana Island Fog Signal
OE ()
100 43 45 48 69 19 38
314 IV Halfway Rock Lighthouse
O ()
20 43 39 21 70 02 15
314 V Eastern Point Lighthouse
RT ()
20 42 34 50 70 39 54
314 VI Portland Lighted Horn Buoy P Lightship
PH ()
50 43 31 37 70 05 31
324 I, IV Cleveland Ledge Lighthouse
C ()
20 41 37 51 70 41 42
324 II Butler Flats Lighthouse
R ()
20 41 36 13 70 53 42
324 III, VI Nobska Point Lighthouse
G ()
20 41 30 58 70 39 20
324 V Cape Cod Canal Breakwater Lighthouse
U ()
20 41 46 28 70 29 50

Continuous Radiobeacons

290 Chesapeake Lighthouse
P ()
70 36 54 15 75 42 47
295 Scituate Harbor Radiobeacon
SH ()
10 42 11 56 70 43 01

Marker Radiobeacons

292 Brenton Reef Lighthouse     41 25 35 71 23 22
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
295 Stratford Shoal Lighthouse
P ()
20 41 03 36 73 06 06
302 Manasquan Inlet Radiobeacon     40 06 03 74 02 03
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
317 Point Judith Lighthouse
PJ ()
10 41 21 39 71 28 55
320 Cuckolds Lighthouse     43 46 46 69 39 02
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 or a coded Morse character.