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15 CHANNEL ASSIGNMENTS
Tables on the following columns list the VHF Marine Channel assignments
for U.S.A. and International use. Below are listed some data about the
charts.
1. VTS. Where indicated, these channels are part of the U.S. Coast Guard’s
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2. Alpha channel numbers, that is, channel numbers followed by the letter A
(such as Channel 07
A
) are
simplex
channels on the U.S.A. or Canadian
channel assignments whose counterparts in the International assign-
ments are
duplex
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numbers. If you call the Coast Guard on Channel 16, they will sometimes
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go to channel 22 Alpha
.” This is a channel assigned to U.S.A,
and Canadian Coast Guards for handling distress and other calls. If your
radio is set for
International
operation you will go to Channel 22 instead
of 22
A
, and will not be able to communicate with the Coast Guard. To
use Channel 22
A
, your radio must be set for
USA
or
Canada
operation,
usually by a U/I/C (USA/International/Canada) control or combination of
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International
duplex channel
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channel is selected based on the U/I/C setting.
3. Bridge-to-Bridge channels (for example, Channel 13) are for use by
bridge operators on inter-coastal waterways and rivers. It is also used
by marine vessels in the vicinity of these bridges for navigation and for
communicating with the bridge operators. Note that a limit of 1 Watt is
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4. The
S/D
column on the chart indicates either S (simplex) or D (duplex).
Simplex
means transmitting and receiving on the same frequency. Only
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over
”
and release your microphone push-to-talk switch at the end of each
transmission.
Duplex
operation involves the use of one frequency for
transmitting and a separate frequency for receiving. On channels speci-
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change the mode. And you still must release the push-to-talk switch after
each transmission in order to listen to the radio.
5. Channels normally used by recreational boaters are those that include
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Channel Use
column of the chart.
Some of these are shared with other users and some are used only in
certain geographic regions.