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4 MHz Duplex Channels

ITU Channel No. Coast Transmit kHz Ship Transmit kHz
401 4357 4065
402 4360 4068
403 4363 4071
404 4366 4074
405 4369 4077
406 4372 4080
407 4375 4083
408 4378 4086
409 4381 4089
410 4384 4092
411 4387 4095
412 4390 4098
413 4393 4101
414 4396 4104
415 4399 4107
416 4402 4110
417 4405 4113
418 4408 4116
419 4411 4119
420 4414 4122
421 4417

4125
(USCG Calling
(See Note below)

422 4420 4128
423 4423 4131
424 4426 4134
425 4429 4137
426 4432 4140
427 4435 4143
428 4351 (varies)
429 4354 (varies)

Note regarding channel 421: 4125 kHz is used for calling, and is for GMDSS distress and safety communications, in the simplex mode. Distress and safety communications have priority over all other communications. The USCG urges that channel 421 not be used in the duplex mode.