New VHF frequency arrangement.
Rich
D.J.J. Ring, Jr.
 | United States Coast Guard Navigation Center Department of Homeland Security |  |
| New Channel Number | Old Channel Number | Ship Transmit MHz | Ship Receive MHz | Use |
|---|---|---|---|---|
| 1001 | 01A | 156.050 | 156.050 | Port Operations and Commercial, VTS. Available only in New Orleans / Lower Mississippi area. |
| 1005 | 05A | 156.250 | 156.250 | Port Operations or VTS in the Houston, New Orleans and Seattle areas. |
| 06 | 06 | 156.300 | 156.300 | Intership Safety |
| 1007 | 07A | 156.350 | 156.350 | Commercial. VDSMS |
| 08 | 08 | 156.400 | 156.400 | Commercial (Intership only). VDSMS |
| 09 | 09 | 156.450 | 156.450 | Boater Calling. Commercial and Non-Commercial. VDSMS |
| 10 | 10 | 156.500 | 156.500 | Commercial. VDSMS |
| 11 | 11 | 156.550 | 156.550 | Commercial. VTS in selected areas. VDSMS |
| 12 | 12 | 156.600 | 156.600 | Port Operations. VTS in selected areas. |
| 13 | 13 | 156.650 | 156.650 | Intership Navigation Safety (Bridge-to-bridge). Ships >20m length maintain a listening watch on this channel in US waters. |
| 14 | 14 | 156.700 | 156.700 | Port Operations. VTS in selected areas. |
| 15 | 15 | -- | 156.750 | Environmental (Receive only). Used by Class C EPIRBs. |
| 16 | 16 | 156.800 | 156.800 | International Distress, Safety and Calling. Ships required to carry radio, USCG, and most coast stations maintain a listening watch on this channel. See ourWatchkeeping Regulations page. |
| 17 | 17 | 156.850 | 156.850 | State & local govt maritime control |
| 1018 | 18A | 156.900 | 156.900 | Commercial. VDSMS |
| 1019 | 19A | 156.950 | 156.950 | Commercial. VDSMS |
| 20 | 20 | 157.000 | 161.600 | Port Operations (duplex) |
| 1020 | 20A | 157.000 | 157.000 | Port Operations |
| 1021 | 21A | 157.050 | 157.050 | U.S. Coast Guard only |
| 1022 | 22A | 157.100 | 157.100 | Coast Guard Liaison and Maritime Safety Information Broadcasts. Broadcasts announced on channel 16. |
| 1023 | 23A | 157.150 | 157.150 | U.S. Coast Guard only |
| 24 | 24 | 157.200 | 161.800 | Public Correspondence (Marine Operator). VDSMS |
| 25 | 25 | 157.250 | 161.850 | Public Correspondence (Marine Operator). VDSMS |
| 26 | 26 | 157.300 | 161.900 | Public Correspondence (Marine Operator). VDSMS |
| 27 | 27 | 157.350 | 161.950 | Public Correspondence (Marine Operator). VDSMS |
| 28 | 28 | 157.400 | 162.000 | Public Correspondence (Marine Operator). VDSMS |
| 1063 | 63A | 156.175 | 156.175 | Port Operations and Commercial, VTS. Available only in New Orleans / Lower Mississippi area. |
| 1065 | 65A | 156.275 | 156.275 | Port Operations |
| 1066 | 66A | 156.325 | 156.325 | Port Operations |
| 67 | 67 | 156.375 | 156.375 | Commercial. Used for Bridge-to-bridge communications in lower Mississippi River. Intership only. |
| 68 | 68 | 156.425 | 156.425 | Non-Commercial. VDSMS |
| 69 | 69 | 156.475 | 156.475 | Non-Commercial. VDSMS |
| 70 | 70 | 156.525 | 156.525 | Digital Selective Calling (voice communications not allowed) |
| 71 | 71 | 156.575 | 156.575 | Non-Commercial. VDSMS |
| 72 | 72 | 156.625 | 156.625 | Non-Commercial (Intership only). VDSMS |
| 73 | 73 | 156.675 | 156.675 | Port Operations |
| 74 | 74 | 156.725 | 156.725 | Port Operations |
| 77 | 77 | 156.875 | 156.875 | Port Operations (Intership only) |
| 1078 | 78A | 156.925 | 156.925 | Non-Commercial. VDSMS |
| 1079 | 79A | 156.975 | 156.975 | Commercial. Non-Commercial in Great Lakes only. VDSMS |
| 1080 | 80A | 157.025 | 157.025 | Commercial. Non-Commercial in Great Lakes only. VDSMS |
| 1081 | 81A | 157.075 | 157.075 | U.S. Government only - Environmental protection operations. |
| 1082 | 82A | 157.125 | 157.125 | U.S. Government only |
| 1083 | 83A | 157.175 | 157.175 | U.S. Coast Guard only |
| 84 | 84 | 157.225 | 161.825 | Public Correspondence (Marine Operator). VDSMS |
| 85 | 85 | 157.275 | 161.875 | Public Correspondence (Marine Operator). VDSMS |
| 86 | 86 | 157.325 | 161.925 | Public Correspondence (Marine Operator). VDSMS |
| 87 | 87 | 157.375 | 157.375 | Public Correspondence (Marine Operator). VDSMS |
| 88 | 88 | 157.425 | 157.425 | Commercial, Intership only. VDSMS |
| AIS 1 | AIS 1 | 161.975 | 161.975 | Automatic Identification System (AIS) |
| AIS 2 | AIS 2 | 162.025 | 162.025 | Automatic Identification System (AIS) |
Note: VDSMS (VHF Digital Small Message Services). Transmissions of short digital messages in accordance with RTCM Standard 12301.1 is allowed.
Frequencies are in MHz. Modulation is 16KF3E or 16KG3E.
Note that the four digit channel number beginning with the digits "10" indicates simplex use of the ship station transmit side of what had been an international duplex channel. These new channel numbers, now recognized internationally, were previously designated in the US by the two digit channel number ending with the letter "A". That is, the international channel 1005 has been designated in the US by channel 05A, and the US Coast Guard channel 1022 has been designated in the US as channel 22A. Four digit channels beginning with "20", sometimes shown by the two-digit channel number ending with the letter "B", indicates simplex use of the coast station transmit side of what normally was an international duplex channel. The U.S. does not currently use "B" or "20NN" channels in the VHF maritime band. Some VHF transceivers are equipped with an "International - U.S." switch to avoid conflicting use of these channels. See ITU Radio Regulation Appendix 18 and ITU-R M.1084-5 Annex 4, summarized here.
These new channel numbers should eventually begin to be displayed on new models of VHF marine radios.
Boaters should normally use channels listed as Non-Commercial. Channel 16 is used for calling other stations or for distress alerting. Channel 13 should be used to contact a ship when there is danger of collision. All ships of length 20m or greater are required to guard VHF channel 13, in addition to VHF channel 16, when operating within U.S. territorial waters. Users may be fined by the FCC for improper use of these channels. See Marine Radio Watch Requirements for further information.
VHF Maritime Spectrum Chart
NOAA Weather Radio Frequencies
| Channel | Frequency (MHz) |
|---|---|
WX1 | 162.550 |
WX2 | 162.400 |
WX3 | 162.475 |
WX4 | 162.425 |
WX5 | 162.450 |
WX6 | 162.500 |
WX7 | 162.525 |
Channel numbers, e.g. (WX1, WX2) etc. have no special significance but are often designated this way in consumer equipment. Other channel numbering schemes are also prevalent.
The order of channels shown is the order they were established and is slowly becoming less "popular" over time than a numerical ordering of channels.
See NATIONAL WEATHER SERVICE MARINE PRODUCTS VIA NOAA WEATHER RADIO and the NOAA Weather Radio Homepage for more information.
Additional Information, Frequencies, & Charts
Also available are International VHF Maritime Radio Channels and Frequencies, Narrowband VHF Maritime Channels and Frequencies, Radio Information for Boaters , and U.S. Coast Guard VHF Distress and Safety Coverage Charts.
Radio KH6O
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David Oakden
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RICH MC CLUNG
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Radio KH6O
>RICH WA6KNW
Stop it. All four of my VHF marine band transceivers (Raytheon,
Intech, Uniden, Motorola) have Channel 3. It was *once* designated for
maritime use. It now has law enforcement comms on it. So again I ask,
when, in the US, did Ch. 3 become obsolete for maritime use?
My 1968 ITU manual shows that channel was allocated for public correspondence.
Jeff KH6O