HF marine

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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
16360-17460 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 - the 25 MHz and 26 MHz bands are shared with land mobile and fixed/mobile services
26145-26175 kHz HF 26 MHz marine band - shared with fixed mobile services, including ocean-based telemetry systems
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 4071 kHz 4363 kHz
404 4074 kHz 4366 kHz
405 4077 kHz 4369 kHz
406 4080 kHz 4372 kHz
407 4083 kHz 4375 kHz
408 4086 kHz 4378 kHz
409 4089 kHz 4381 kHz
410 4092 kHz 4384 kHz
411 4095 kHz 4387 kHz
412 4098 kHz 4390 kHz
413 4101 kHz 4393 kHz
414 4104 kHz 4396 kHz
415 4107 kHz 4399 kHz
416 4110 kHz 4402 kHz
417 4113 kHz 4405 kHz
418 4116 kHz 4408 kHz
419 4119 kHz 4411 kHz
420 4122 kHz 4414 kHz
421 4125 kHz 4417 kHz
422 4128 kHz 4420 kHz
423 4131 kHz 4423 kHz
424 4134 kHz 4426 kHz
425 4137 kHz 4429 kHz
426 4140 kHz 4432 kHz
427 4143 kHz 4435 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:

Note that "channel 833" is programmed in SSB marine radios in simplex mode only. It is the 8 MHz distress/calling frequency, 8291 kHz.

ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
801 8195 kHz 8719 kHz
802 8198 kHz 8722 kHz
803 8201 kHz 8725 kHz
804 8204 kHz 8728 kHz
805 8207 kHz 8731 kHz
806 8210 kHz 8734 kHz
807 8213 kHz 8737 kHz
808 8216 kHz 8740 kHz
809 8219 kHz 8743 kHz
810 8222 kHz 8746 kHz
811 8225 kHz 8749 kHz
812 8228 kHz 8752 kHz
813 8231 kHz 8755 kHz
814 8234 kHz 8758 kHz
815 8237 kHz 8761 kHz
816 8240 kHz 8764 kHz
817 8243 kHz 8767 kHz
818 8246 kHz 8770 kHz
819 8249 kHz 8773 kHz
820 8252 kHz 8776 kHz
821 8255 kHz 8779 kHz
822 8258 kHz 8782 kHz
823 8261 kHz 8785 kHz
824 8264 kHz 8788 kHz
825 8267 kHz 8791 kHz
826 8270 kHz 8794 kHz
827 8273 kHz 8797 kHz
828 8276 kHz 8800 kHz
829 8279 kHz 8803 kHz
830 8282 kHz 8806 kHz
831 8285 kHz 8809 kHz
832 8288 kHz 8812 kHz
  • 12 MHz / 13 MHz (12330 kHz - 13200 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
1201 12230 kHz 13077 kHz
1202 12233 kHz 13080 kHz
1203 12236 kHz 13083 kHz
1204 12239 kHz 13086 kHz
1205 12242 kHz 13089 kHz
1206 12245 kHz 13092 kHz
1207 12248 kHz 13095 kHz
1208 12251 kHz 13098 kHz
1209 12254 kHz 13101 kHz
1210 12257 kHz 13104 kHz
1211 12260 kHz 13107 kHz
1212 12263 kHz 13110 kHz
1213 12266 kHz 13113 kHz
1214 12269 kHz 13116 kHz
1215 12272 kHz 13119 kHz
1216 12275 kHz 13122 kHz
1217 12278 kHz 13125 kHz
1218 12281 kHz 13128 kHz
1219 12284 kHz 13131 kHz
1220 12287 kHz 13134 kHz
1221 12290 kHz 13137 kHz
1222 12293 kHz 13140 kHz
1223 12296 kHz 13143 kHz
1224 12299 kHz 13146 kHz
1225 12302 kHz 13149 kHz
1226 12305 kHz 13152 kHz
1227 12308 kHz 13155 kHz
1228 12311 kHz 13158 kHz
1229 12314 kHz 13161 kHz
1230 12317 kHz 13164 kHz
1231 12320 kHz 13167 kHz
1232 12323 kHz 13170 kHz
1233 12326 kHz 13173 kHz
1234 12329 kHz 13176 kHz
1235 12332 kHz 13179 kHz
1236 12335 kHz 13182 kHz
1237 12338 kHz 13185 kHz
1238 12341 kHz 13188 kHz
1239 12344 kHz 13191 kHz
1240 12347 kHz 13194 kHz
1241 12347 kHz 13197 kHz
  • 16 MHz / 17 MHz (16360 kHz - 17460 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
1601 16360 kHz 17242 kHz
1602 16363 kHz 17245 kHz
1603 16366 kHz 17248 kHz
1604 16369 kHz 17251 kHz
1605 16372 kHz 17254 kHz
1606 16375 kHz 17257 kHz
1607 16378 kHz 17260 kHz
1608 16381 kHz 17263 kHz
1609 16384 kHz 17266 kHz
1610 16387 kHz 17269 kHz
1611 16390 kHz 17272 kHz
1612 16393 kHz 17275 kHz
1613 16396 kHz 17278 kHz
1614 16399 kHz 17281 kHz
1615 16402 kHz 17284 kHz
1616 16405 kHz 17287 kHz
1617 16408 kHz 17290 kHz
1618 16411 kHz 17293 kHz
1619 16414 kHz 17296 kHz
1620 16417 kHz 17299 kHz
1621 16420 kHz 17302 kHz
1622 16423 kHz 17305 kHz
1623 16426 kHz 17308 kHz
1624 16429 kHz 17311 kHz
1625 16432 kHz 17314 kHz
1626 16435 kHz 17317 kHz
1627 16438 kHz 17320 kHz
1628 16441 kHz 17323 kHz
1629 16444 kHz 17326 kHz
1630 16447 kHz 17329 kHz
1631 16450 kHz 17332 kHz
1632 16453 kHz 17335 kHz
1633 16456 kHz 17338 kHz
1634 16459 kHz 17341 kHz
1635 16462 kHz 17344 kHz
1636 16465 kHz 17347 kHz
1637 16468 kHz 17350 kHz
1638 16471 kHz 17353 kHz
1639 16474 kHz 17356 kHz
1640 16477 kHz 17359 kHz
1641 16480 kHz 17362 kHz
1642 16483 kHz 17365 kHz
1643 16486 kHz 17368 kHz
1644 16489 kHz 17371 kHz
1645 16492 kHz 17374 kHz
1646 16495 kHz 17377 kHz
1647 16498 kHz 17380 kHz
1648 16501 kHz 17383 kHz
1649 16504 kHz 17386 kHz
1650 16507 kHz 17389 kHz
1651 16510 kHz 17392 kHz
1652 16513 kHz 17395 kHz
1653 16516 kHz 17398 kHz
1654 16519 kHz 17401 kHz
1655 16522 kHz 17404 kHz
1656 16525 kHz 17407 kHz
  • 18 MHz (18780 kHz - 18900 kHz) / 19 MHz (19680 kHz - 19800 kHz) 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 22000 kHz 22696 kHz
2202 22003 kHz 22699 kHz
2203 22006 kHz 22702 kHz
2204 22009 kHz 22705 kHz
2205 22012 kHz 22708 kHz
2206 22015 kHz 22711 kHz
2207 22018 kHz 22714 kHz
2208 22021 kHz 22717 kHz
2209 22024 kHz 22720 kHz
2210 22027 kHz 22723 kHz
2211 22030 kHz 22726 kHz
2212 22033 kHz 22729 kHz
2213 22036 kHz 22732 kHz
2214 22039 kHz 22735 kHz
2215 22042 kHz 22738 kHz
2216 22045 kHz 22741 kHz
2217 22048 kHz 22744 kHz
2218 22051 kHz 22747 kHz
2219 22054 kHz 22750 kHz
2220 22057 kHz 22753 kHz
2221 22060 kHz 22756 kHz
2222 22063 kHz 22759 kHz
2223 22066 kHz 22762 kHz
2224 22069 kHz 22765 kHz
2225 22072 kHz 22768 kHz
2226 22075 kHz 22771 kHz
2227 22078 kHz 22774 kHz
2228 22081 kHz 22777 kHz
2229 22084 kHz 22780 kHz
2230 22087 kHz 22783 kHz
2231 22090 kHz 22786 kHz
2232 22093 kHz 22789 kHz
2233 22096 kHz 22792 kHz
2234 22099 kHz 22795 kHz
2235 22102 kHz 22798 kHz
2236 22105 kHz 22801 kHz
2237 22108 kHz 22804 kHz
2238 22111 kHz 22807 kHz
2239 22114 kHz 22810 kHz
2240 22117 kHz 22813 kHz
2241 22120 kHz 22816 kHz
2242 22123 kHz 22819 kHz
2243 22126 kHz 22822 kHz
2244 22129 kHz 22825 kHz
2245 22132 kHz 22828 kHz
2246 22135 kHz 22831 kHz
2247 22138 kHz 22834 kHz
2248 22141 kHz 22837 kHz
2249 22144 kHz 22840 kHz
2250 22147 kHz 22843 kHz
2251 22150 kHz 22846 kHz
2252 22153 kHz 22849 kHz
2253 22156 kHz 22852 kHz
  • 25 MHz (25070 kHz - 25121 kHz) and 26 MHz (26145 kHz - 26175 kHz) marine band:
ITU Channel Ship Transmit / Coast Receive Coast Transmit / Ship Receive
2501 25070 kHz 26145 kHz
2502 25073 kHz 26148 kHz
2503 25076 kHz 26151 kHz
2504 25079 kHz 26154 kHz
2505 25082 kHz 26157 kHz
2506 25085 kHz 26160 kHz
2507 25088 kHz 26163 kHz
2508 25091 kHz 26166 kHz
2509 25094 kHz 26169 kHz
2510 25097 kHz 26172 kHz

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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