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Maritime SSB Simplex Channels

Channel 4 MHz Channel 6 MHz Channel 8 MHz Channel 12 MHz
4A 4146 kHz 6A 6224 kHz 8A 8294 kHz 12A 12,353 kHz
4B 4149 kHz 6B 6227 kHz 8B 8297 kHz 12B 12,356  kHz
4C 4417 kHz 6C 6230 kHz   12C 12,359 kHz
      6516 (daytime only)     12D 12,362  kHz
  4065,4089,4116,4408
Mississippi River  		  6209,6212,6510,6513
Mississippi River 		  8201,8213,8725,8737
Mississippi River 		12E 12,365 kHz

 

 

 

  

12,362 12,365
Mississippi River

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Channel 16 MHz Channel 18 MHz Channel 22 MHz Channel 25/26 MHz
16A 16,528 18A 18,825 22A 22,159 25A 25,100
16B 16,531 18B 18,828 22B 22,162 25B 25,103
16C 16,534 18C 18,831 22C 22,165 25C 25,106
16D 16,537 18D 18,834 22D 22,168 25D 25,109
16E 16,540 18E 18,837 22E 22,171 25E 25,112
  16,543, 16,546
Mississippi River		 18F 18,840 22F 22,174 25F 25,115
18G 18,843 22G 22,177 25G 25,118
Revised 04/26/21 Source: https://www.navcen.uscg.gov/?pageName=rtchansi

Maritime SSB Simplex Frequencies Shared with Fixed Services, e.g. MARS
4 MHz Carrier Frequency kHz 8 MHz Carrier Frequency kHz
4000 8101
4003 8104
4006 8107
4009 8110
4012 8113
4015 8116
4018 8119
4021 8122
4024 8125
4027 8128
4030 8131
4033 8134
4036 8137
4039 8140
4042 8143
4045 8146
4048 8149
4051 8152
4054 8155
4057 8158
4060 8161
-- 8164
-- 8167
-- 8170
-- 8173
-- 8176
-- 8179
-- 8182
-- 8185
-- 8188
-- 8191

Revised 04/26/21

Source: https://www.navcen.uscg.gov/?pageName=rtchansi

Notes:  

These are shared with "fixed" stations.  If the frequency is occupied, we must choose another frequency. 
No channel numbers are assigned to these frequencies. They are referred to by the frequency itself, e.g., "...meet you on 8122...".

 

2 MHZ MARINE RADIOTELEPHONE FREQUENCIES
Intership Safety and Operational Communications.

Carrier Frequency (kHz)

Geographic Area

2003.0

 Great Lakes only

2782.0

 Mississippi River System working frequency

2082.5

 All Areas. Also, Intership non-commercial fishing.

2086.0

 Mississippi River System working frequency

2093.0

 All Areas.

2142.0

 Pacific Coast, daily, south of 42 deg. N

2182.0

 Distress, safety & calling (No longer monitored by US Coast Guard)

2203.0

 Gulf of Mexico. Also, Intership non-commercial fishing.

2214.0

 All Areas.

2635.0

 ITU Regions 2-3 (ITU RR 4193). Not in FCC rules.

2638.0

 All Areas.

2738.0

 All Areas, except Great Lakes. Shared with aircraft.

2830.0

 Gulf of Mexico only. Shared with aircraft.

Source: http://www.navcen.uscg.gov/?pageName=rtchan2                                                                                                                     04/26/21

 

Global Maritime Distress & Safety System (GMDSS)
Simplex DSC & Radiotelephone Frequencies

DSC VOICE DSC VOICE
2187.51 21821 8414.5 8291
4207.5 4125 12,577 12,290
6312.0 6215 16,804.5 16,420

Notes:  

DSC Frequencies are 'guarded' (monitored) frequencies. They are used for distress, urgency, and safety. Switch to the corresponding voice frequency after the DSC call is made and acknowledged.
Voice frequencies are not normally guarded. They are to be used only for distress, urgency, and safety related communications.

1

 USCG Watchkeeping on 2187.5 & 2182 discontinued effective 01 August 2013

Source:

https://www.navcen.uscg.gov/?pageName=cgcommsCall

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