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Ship TransmitShip ReceiveUse
01A156.050156.050Port Operations and Commercial, VTS.  Available only in New Orleans/Lower Mississippi area.
05A156.250156.250Port Operations or VTS in the Houston, New Orleans and Seattle areas.
6156.300156.300Intership Safety
8156.400156.400Commercial (Intership only)
9156.450156.450Boater Calling.  Commercial and Non-Commercial.
11156.550156.550Commercial.  VTS in selected areas.
12156.600156.600Port Operations.  VTS in selected areas.
13156.650156.650Intership Navigation Safety (Bridge-to-bridge).  Ships >20m length maintain a listening watch on this channel in US waters.
14156.700156.700Port Operations.  VTS in selected areas.
15156.750Environmental (Receive only).  Used by Class C EPIRBs.
16156.800156.800International Distress, Safety and Calling.  Ships required to carry radio, USCG, and most coast stations maintain a listening watch on this channel.
17156.850156.850State Control
20157.000161.600Port Operations (duplex)
20A157.000157.000Port Operations
21A157.050157.050U.S. Coast Guard only
22A157.100157.100Coast Guard Liaison and Maritime Safety Information Broadcasts.   Broadcasts announced on channel 16.
23A157.150157.150U.S. Coast Guard only
24157.200161.800Public Correspondence (Marine Operator)
25157.250161.850Public Correspondence (Marine Operator)
26157.300161.900Public Correspondence (Marine Operator)
27157.350161.950Public Correspondence (Marine Operator)
28157.400162.000Public Correspondence (Marine Operator)
63A156.175156.175Port Operations and Commercial, VTS.  Available only in New Orleans/Lower Mississippi area.
65A156.275156.275Port Operations
66A156.325156.325Port Operations
67156.375156.375Commercial.  Used for Bridge-to-bridge communications in lower Mississippi River.  Intership only.
70156.525156.525Digital Selective Calling (voice communications not allowed)
72156.625156.625Non-Commercial (Intership only)
73156.675156.675Port Operations
74156.725156.725Port Operations
77156.875156.875Port Operations (Intership only)
79A156.975156.975Commercial.  Non-Commercial in Great Lakes only
80A157.025157.025Commercial.  Non-Commercial in Great Lakes only
81A157.075157.075U.S. Government only – Environmental protection operations.
82A157.125157.125U.S. Government only
83A157.175157.175U.S. Coast Guard only
84157.225161.825Public Correspondence (Marine Operator)
85157.275161.875Public Correspondence (Marine Operator)
86157.325161.925Public Correspondence (Marine Operator)
87A157.375157.375Public Correspondence (Marine Operator)
88A157.425157.425Commercial, Intership only.
AIS 1161.975161.975Automatic Identification System (AIS) 
AIS 2 162.025162.025Automatic Identification System (AIS) 

Additional Information, Frequencies, & Charts

Frequencies are in MHz. Modulation is 16KF3E or 16KG3E.

Note that the letter “A” indicates simplex use of the ship station transmit side of an international duplex channel, and that operations are different than international operations on that channel. Some VHF transceivers are equipped with an “International – U.S.” switch for that purpose. “A” channels are generally only used in the United States, and use is normally not recognized or allowed outside the U.S. The letter “B” indicates simplex use of the coast station transmit side of an international duplex channel. The U.S. does not currently use “B” channels for simplex communications in this band.

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.

See the Federal Communications Commission’s Marine VHF Radio Channels page. The FCC page does not include frequency information, but has more complete information on the use of the channels. If you notice any discrepancy between these two lists, please notify the U.S. Coast Guard at [email protected].

Source: americanboating.orgNavigation Center of the U.S. Coast Guard