HF marine

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(ITU Designated Duplex Frequencies)
(ITU Designated Duplex Frequencies)
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*'''22 MHz (22000 kHz - 22855 kHz) marine band:'''
*'''22 MHz (22000 kHz - 22855 kHz) marine band:'''
 +
{| class="wikitable"
 +
! ITU Channel
 +
! Ship Transmit / Coast Receive
 +
! Coast Transmit / Ship Receive
 +
|-
 +
|2201
 +
| kHz
 +
| kHz
 +
|-
 +
|2202
 +
| kHz
 +
| kHz
 +
|-
 +
|2203
 +
| kHz
 +
| kHz
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|-
 +
|2204
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2205
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2206
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2207
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2208
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2209
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2210
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2211
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2212
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2213
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2214
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2215
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2216
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2217
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2218
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2219
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2220
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2221
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2222
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2223
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2224
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2225
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2226
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2227
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2228
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2229
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2230
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2231
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2232
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2233
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2234
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2235
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2236
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2237
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2238
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2239
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2240
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2241
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2242
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2243
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2244
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2245
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2246
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2247
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2248
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2249
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2250
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2251
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2252
 +
|4065 kHz
 +
|4357 kHz
 +
|-
 +
|2253
 +
|4065 kHz
 +
|4357 kHz
 +
|}
*'''25 MHz (25070 kHz - 25121 kHz) marine band:'''
*'''25 MHz (25070 kHz - 25121 kHz) marine band:'''

Revision as of 14:50, 17 July 2019

HF-SSB marine bands - these are standardized maritime mobile MF and HF communications bands - note that many maritime mobile users operate outside of these bands and there are dozens of country- or region-specific additional bands/frequencies. These bands are used for USB voice transmissions, various data modes including FAX used for Maritime Fax Transmissions, FSK, modes for various purposes as well as USB voice and RTTY weather and emergency broadcasts to ships at sea.

Fisheries, fishing boats, and other commercial marine users will often use frequencies in the HF aeronautical or aircraft bands (including the 6525 kHz to 6685 kHz and 6685 kHz to 6765 kHz military aircraft 6 MHz subbands 6525 kHz to 6765 kHz), other HF aircraft bands, fixed/mobile band (including 43 meters - 6765-7000 kHz) clear frequencies in the shortwave broadcast bands or even amateur frequencies for "out of band" communications to reduce the chance of radio interception by their competition. Out of band frequencies are also used in other ITU regions for marine fax transmissions.


See also: VHF marine band

MF-SSB and HF-SSB marine traffic (usually in the bands above 4 MHz) can be in simplex or semi-duplex for voice and/or data. Cross-band operation is also allowed per ITU regulations. Often you will hear ship-to-ship communications in simplex mode on the "ship transmit" frequency of a duplex pair.

MF SSB and HF SSB marine bands

Band Frequency Range
405-525 kHz MF band, used in some areas for NAVTEX on 490 kHz and/or 518 kHz. 500 kHz or 500 kc (600 meters) was the original CW Morse code calling frequency
1600-2000 kHz MF band, used in Europe and elsewhere (also used heavily for fishnet beacons) - overlaps with 1800-2000 kHz 160 meter amateur band
2000-2300 kHz MF 2 MHz marine band - USB voice calling/distress 2182 kHz, DSC calling/distress 2187.5 kHz - USCG no longer monitors 2182 kHz USB
2450-2850 kHz MF 2 MHz marine band, USB voice and FSK modes, some AM voice heard here in Russia, Eastern Europe and Asia (older-generation trawler radios 2-3 MHz)
4000-4063 kHz 4 MHz fixed/mobile band, shared with marine for simplex purposes, can be paired cross-band with 8 MHz
4063-4438 kHz HF 4 MHz marine band - USB voice calling/distress 4125 kHz, DSC calling/distress 4207.5 kHz
6200-6525 kHz HF 6 MHz marine band - USB voice calling/distress 6215 kHz, DSC calling/distress 6312 kHz
8000-8195 kHz 8 MHz fixed/mobile band, shared with marine for simplex purposes, can be paired cross-band with 4 MHz
8195-8815 kHz HF 8 MHz marine band - USB voice calling/distress 8291 kHz, DSC calling/distress 8414.5 kHz
12330-13200 kHz HF 12 MHz marine band - USB voice calling/distress 12290 kHz, DSC calling/distress 12577 kHz
16460-17360 kHz HF 16 MHz/17 MHz marine band - USB voice calling/distress 16420 kHz, DSC calling/distress 16804.5 kHz
18780-18900 kHz HF 18 MHz marine band
19680-19800 kHz HF 19 MHz marine band
22000-22855 kHz HF 22 MHz marine band
25070-25121 kHz HF 25 MHz marine band
26145-26175 kHz HF 26 MHz marine band
26175-30000 kHz Various CB-like marine allocations found in this region (many SSB marine radios stop at 27500 kHz or 27.5 MHz)
SEA 209 2/4/6/8 MHz MF-SSB/HF-SSB marine transceiver - note the band switch + channel selector + clarifier or clarify (fine tune) control (labelled as clarity on this radio) combination with frequency display, similar to how export CB radios operate. This particular radio only covers the lower MF/HF SSB marine bands, 2 MHz, 4 MHz, 6 MHz and 8 MHz marine bands
SEA 235 2-30 MHz MF-SSB/HF-SSB marine transceiver
ICOM IC-M802 2-30 MHz MF-SSB/HF-SSB marine transceiver

ITU Designated Simplex Frequencies

These frequencies are specifically designated for simplex use (ship-to-ship and/or ship-to-shore comms). Any frequency in the MF and HF marine bands may be used for simplex purposes, including the duplex channelized frequencies. Often the "ship TX" or "ship transmit" frequency is used for ship-to-ship communications. However, either frequency may be used for simplex communications. Frequencies in-between the ITU channels may be used for voice or data communications as well. USB mode is normally used, with some LSB. AM is rarely used, although it is found in the 2-3 MHz region in some parts of the world.

  • 2 MHz (2000 kHz - 2850 kHz) marine band:
  • 2003.0 kHz
  • 2065.0 kHz
  • 2079.0 kHz
  • 2082.5 kHz
  • 2086.0 kHz
  • 2093.0 kHz
  • 2096.5 kHz
  • 2142.0 kHz
  • 2203.0 kHz
  • 2214.0 kHz
  • 2635.0 kHz
  • 2638.0 kHz
  • 2670.0 kHz - this frequency is also used for maritime weather forecasts
  • 2738.0 kHz
  • 2782.0 kHz
  • 2830.0 kHz
  • 4 MHz (4000 kHz - 4438 kHz) marine band:
  • 4146.0 kHz
  • 4149.0 kHz
  • 4417.0 kHz
  • 4000 kHz to 4060 kHz are also designed for simplex maritime radio use, in 3 kHz steps (4000 kHz, 4003 kHz, 4006 kHz, etc.), shared with fixed/mobile service
  • 6 MHz (6200 kHz - 6525 kHz) marine band:
  • 6224.0 kHz
  • 6227.0 kHz
  • 6230.0 kHz
  • 6516.0 kHz
  • 8 MHz (8000 kHz - 8815 kHz) marine band:
  • 8294.0 kHz
  • 8297.0 kHz
  • 8101 kHz to 8191 kHz are also designed for simplex maritime radio use, in 3 kHz steps (8101 kHz, 8104 kHz, 8107 kHz, etc.), shared with fixed/mobile service
  • 12 MHz / 13 MHz (12330 kHz - 13200 kHz) marine band:
  • 12353.0 kHz
  • 12356.0 kHz
  • 12359.0 kHz
  • 12362.0 kHz
  • 12365.0 kHz
  • 16 MHz / 17 MHz (16460 kHz - 17360 kHz) marine band:
  • 16528.0 kHz
  • 16531.0 kHz
  • 16534.0 kHz
  • 16537.0 kHz
  • 16540.0 kHz
  • 16543.0 kHz
  • 16546.0 kHz
  • 18 MHz (18780 kHz - 18900 kHz) marine band:
  • 18825.0 kHz
  • 18828.0 kHz
  • 18831.0 kHz
  • 18834.0 kHz
  • 18837.0 kHz
  • 18840.0 kHz
  • 18843.0 kHz
  • 22 MHz (22000 kHz - 22855 kHz) marine band:
  • 22159.0 kHz
  • 22162.0 kHz
  • 22165.0 kHz
  • 22168.0 kHz
  • 22171.0 kHz
  • 22174.0 kHz
  • 22177.0 kHz
  • 25 MHz (25070 kHz - 25121 kHz) marine band:
  • 25100.0 kHz
  • 25103.0 kHz
  • 25106.0 kHz
  • 25109.0 kHz
  • 25112.0 kHz
  • 25115.0 kHz
  • 25118.0 kHz

ITU Designated Duplex Frequencies

These frequencies are specifically designated for duplex use (generally ship-to-shore or shore-to-ship comms). Any frequency in the MF and HF marine bands may be used for simplex purposes, including the duplex channelized frequencies. Often the "ship TX" or "ship transmit" frequency is used for ship-to-ship communications. However, either frequency may be used for simplex communications. Frequencies in-between the ITU channels may be used for voice or data communications as well. USB mode is normally used, with some LSB. AM is rarely used, although it is found in the 2-3 MHz region in some parts of the world.


  • 4 MHz (4000 kHz - 4438 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
401 4065 kHz 4357 kHz
402 4068 kHz 4360 kHz
403 4065 kHz 4357 kHz
404 4065 kHz 4357 kHz
405 4065 kHz 4357 kHz
406 4065 kHz 4357 kHz
407 4065 kHz 4357 kHz
408 4065 kHz 4357 kHz
409 4065 kHz 4357 kHz
410 4065 kHz 4357 kHz
411 4065 kHz 4357 kHz
412 4065 kHz 4357 kHz
413 4065 kHz 4357 kHz
414 4065 kHz 4357 kHz
415 4065 kHz 4357 kHz
416 4065 kHz 4357 kHz
417 4065 kHz 4357 kHz
418 4065 kHz 4357 kHz
419 4065 kHz 4357 kHz
420 4065 kHz 4357 kHz
421 4065 kHz 4357 kHz
422 4065 kHz 4357 kHz
423 4065 kHz 4357 kHz
424 4065 kHz 4357 kHz
425 4065 kHz 4357 kHz
426 4065 kHz 4357 kHz
427 4065 kHz 4357 kHz
428 4065 kHz 4357 kHz
429 4065 kHz 4357 kHz


  • 6 MHz (6200 kHz - 6525 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
601 6200 kHz 6501 kHz
602 6203 kHz 6504 kHz
603 6206 kHz 6507 kHz
604 6209 kHz 6510 kHz
605 6212 kHz 6513 kHz
606 6215 kHz 6516 kHz
607 6218 kHz 6519 kHz
608 6221 kHz 6522 kHz
  • 8 MHz (8000 kHz - 8815 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
801 4065 kHz 4357 kHz
802 4068 kHz 4360 kHz
803 4065 kHz 4357 kHz
804 4065 kHz 4357 kHz
805 4065 kHz 4357 kHz
806 4065 kHz 4357 kHz
807 4065 kHz 4357 kHz
808 4065 kHz 4357 kHz
809 4065 kHz 4357 kHz
810 4065 kHz 4357 kHz
811 4065 kHz 4357 kHz
812 4065 kHz 4357 kHz
813 4065 kHz 4357 kHz
814 4065 kHz 4357 kHz
815 4065 kHz 4357 kHz
816 4065 kHz 4357 kHz
817 4065 kHz 4357 kHz
818 4065 kHz 4357 kHz
819 4065 kHz 4357 kHz
820 4065 kHz 4357 kHz
821 4065 kHz 4357 kHz
822 4065 kHz 4357 kHz
823 4065 kHz 4357 kHz
824 4065 kHz 4357 kHz
825 4065 kHz 4357 kHz
826 4065 kHz 4357 kHz
827 4065 kHz 4357 kHz
828 4065 kHz 4357 kHz
829 4065 kHz 4357 kHz
830 4065 kHz 4357 kHz
831 4065 kHz 4357 kHz
832 4065 kHz 4357 kHz
833 4065 kHz 4357 kHz
  • 12 MHz / 13 MHz (12330 kHz - 13200 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
1201 4065 kHz 4357 kHz
1202 4068 kHz 4360 kHz
1203 4065 kHz 4357 kHz
1204 4065 kHz 4357 kHz
1205 4065 kHz 4357 kHz
1206 4065 kHz 4357 kHz
1207 4065 kHz 4357 kHz
1208 4065 kHz 4357 kHz
1209 4065 kHz 4357 kHz
1210 4065 kHz 4357 kHz
1211 4065 kHz 4357 kHz
1212 4065 kHz 4357 kHz
1213 4065 kHz 4357 kHz
1214 4065 kHz 4357 kHz
1215 4065 kHz 4357 kHz
1216 4065 kHz 4357 kHz
1217 4065 kHz 4357 kHz
1218 4065 kHz 4357 kHz
1219 4065 kHz 4357 kHz
1220 4065 kHz 4357 kHz
1221 4065 kHz 4357 kHz
1222 4065 kHz 4357 kHz
1223 4065 kHz 4357 kHz
1224 4065 kHz 4357 kHz
1225 4065 kHz 4357 kHz
1226 4065 kHz 4357 kHz
1227 4065 kHz 4357 kHz
1228 4065 kHz 4357 kHz
1229 4065 kHz 4357 kHz
1230 4065 kHz 4357 kHz
1231 4065 kHz 4357 kHz
1232 4065 kHz 4357 kHz
1233 4065 kHz 4357 kHz
1234 4065 kHz 4357 kHz
1235 4065 kHz 4357 kHz
1236 4065 kHz 4357 kHz
1237 4065 kHz 4357 kHz
1238 4065 kHz 4357 kHz
1239 4065 kHz 4357 kHz
1240 4065 kHz 4357 kHz
1241 4065 kHz 4357 kHz
  • 16 MHz / 17 MHz (16460 kHz - 17360 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
1601 4065 kHz 4357 kHz
1602 4068 kHz 4360 kHz
1603 4065 kHz 4357 kHz
1604 4065 kHz 4357 kHz
1605 4065 kHz 4357 kHz
1606 4065 kHz 4357 kHz
1607 4065 kHz 4357 kHz
1608 4065 kHz 4357 kHz
1609 4065 kHz 4357 kHz
1610 4065 kHz 4357 kHz
1611 4065 kHz 4357 kHz
1612 4065 kHz 4357 kHz
1613 4065 kHz 4357 kHz
1614 4065 kHz 4357 kHz
1615 4065 kHz 4357 kHz
1616 4065 kHz 4357 kHz
1617 4065 kHz 4357 kHz
1618 4065 kHz 4357 kHz
1619 4065 kHz 4357 kHz
1620 4065 kHz 4357 kHz
1621 4065 kHz 4357 kHz
1622 4065 kHz 4357 kHz
1623 4065 kHz 4357 kHz
1624 4065 kHz 4357 kHz
1625 4065 kHz 4357 kHz
1626 4065 kHz 4357 kHz
1627 4065 kHz 4357 kHz
1628 4065 kHz 4357 kHz
1629 4065 kHz 4357 kHz
1630 4065 kHz 4357 kHz
1631 4065 kHz 4357 kHz
1632 4065 kHz 4357 kHz
1633 4065 kHz 4357 kHz
1634 4065 kHz 4357 kHz
1635 4065 kHz 4357 kHz
1636 4065 kHz 4357 kHz
1637 4065 kHz 4357 kHz
1638 4065 kHz 4357 kHz
1639 4065 kHz 4357 kHz
1640 4065 kHz 4357 kHz
1641 4065 kHz 4357 kHz
1642 4065 kHz 4357 kHz
1643 4065 kHz 4357 kHz
1644 4065 kHz 4357 kHz
1645 4065 kHz 4357 kHz
1646 4065 kHz 4357 kHz
1647 4065 kHz 4357 kHz
1648 4065 kHz 4357 kHz
1649 4065 kHz 4357 kHz
1650 4065 kHz 4357 kHz
1651 4065 kHz 4357 kHz
1652 4065 kHz 4357 kHz
1653 4065 kHz 4357 kHz
1654 4065 kHz 4357 kHz
1655 4065 kHz 4357 kHz
1656 4065 kHz 4357 kHz
  • 18 MHz (18780 kHz - 18900 kHz) / 19 MHz marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
1801 18780 kHz 19755 kHz
1802 18783 kHz 19758 kHz
1803 18786 kHz 19761 kHz
1804 18789 kHz 19764 kHz
1805 18792 kHz 19767 kHz
1806 18795 kHz 19770 kHz
1807 18798 kHz 19773 kHz
1808 18801 kHz 19776 kHz
1809 18804 kHz 19779 kHz
1810 18807 kHz 19782 kHz
1811 18810 kHz 19785 kHz
1812 18813 kHz 19788 kHz
1813 18816 kHz 19791 kHz
1814 18819 kHz 19794 kHz
1815 18822 kHz 19797 kHz
  • 22 MHz (22000 kHz - 22855 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
2201 kHz kHz
2202 kHz kHz
2203 kHz kHz
2204 4065 kHz 4357 kHz
2205 4065 kHz 4357 kHz
2206 4065 kHz 4357 kHz
2207 4065 kHz 4357 kHz
2208 4065 kHz 4357 kHz
2209 4065 kHz 4357 kHz
2210 4065 kHz 4357 kHz
2211 4065 kHz 4357 kHz
2212 4065 kHz 4357 kHz
2213 4065 kHz 4357 kHz
2214 4065 kHz 4357 kHz
2215 4065 kHz 4357 kHz
2216 4065 kHz 4357 kHz
2217 4065 kHz 4357 kHz
2218 4065 kHz 4357 kHz
2219 4065 kHz 4357 kHz
2220 4065 kHz 4357 kHz
2221 4065 kHz 4357 kHz
2222 4065 kHz 4357 kHz
2223 4065 kHz 4357 kHz
2224 4065 kHz 4357 kHz
2225 4065 kHz 4357 kHz
2226 4065 kHz 4357 kHz
2227 4065 kHz 4357 kHz
2228 4065 kHz 4357 kHz
2229 4065 kHz 4357 kHz
2230 4065 kHz 4357 kHz
2231 4065 kHz 4357 kHz
2232 4065 kHz 4357 kHz
2233 4065 kHz 4357 kHz
2234 4065 kHz 4357 kHz
2235 4065 kHz 4357 kHz
2236 4065 kHz 4357 kHz
2237 4065 kHz 4357 kHz
2238 4065 kHz 4357 kHz
2239 4065 kHz 4357 kHz
2240 4065 kHz 4357 kHz
2241 4065 kHz 4357 kHz
2242 4065 kHz 4357 kHz
2243 4065 kHz 4357 kHz
2244 4065 kHz 4357 kHz
2245 4065 kHz 4357 kHz
2246 4065 kHz 4357 kHz
2247 4065 kHz 4357 kHz
2248 4065 kHz 4357 kHz
2249 4065 kHz 4357 kHz
2250 4065 kHz 4357 kHz
2251 4065 kHz 4357 kHz
2252 4065 kHz 4357 kHz
2253 4065 kHz 4357 kHz
  • 25 MHz (25070 kHz - 25121 kHz) marine band:


See also:

  • [1] HF marine distress and calling frequencies
  • [2] US Coast Guard MF and HF SSB marine radiotelephone frequency channel list (duplex and simplex)
  • [3] US Coast Guard MF & HF 2-26 MHz marine SSB channel information
  • [4] Marine Safety Broadcasts MF, HF, VHF and SATCOM broadcasts and services



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