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GX1100SPage 64
14 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
Vessel Traffic System.
2. Alpha channel numbers, that is, channel numbers followed by the letter A (such
as Channel 07A) are simplex channels on the U.S.A. or Canadian channel
assignments whose counterparts in the International assignments are duplex
channels. International channels do not use “alpha” numbers. If you call the
Coast Guard on Channel 16, they will sometimes ask you to “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 22A, and will not be able to communicate
with the Coast Guard. To use Channel 22A, your radio must be set for USA or
Canada operation, usually by a U/I/C (USA/International/Canada) control or
combination of controls. Channel 22 (without an “A”) is an International duplex
channel for port operations. Some radios indicate an “A” adjacent to the alpha
channels on the display; on others “alpha” is not indicated but the proper chan-
nel 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 intercoastal waterways and rivers. It is also used by marine
vessels in the vicinity of these bridges for navigation and for communicat-
ing with the bridge operators. Note that a limit of 1 Watt is specified for
these channels. See page 24 for additional information.
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
one party at a time can talk, unlike a telephone. Be sure to say “over” and
release your microphone push-to-talk switch at the end of each transmis-
sion. Duplex operation involves the use of one frequency for transmitting
and a separate frequency for receiving. On channels specified as duplex
on the charts, correct mode of operation is established automatically by
your radio when you select a channel; you cannot 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 the
term “non-commercial” in the Channel Use column of the chart. Some of
these are shared with other users and some are used only in certain geo-
graphic regions.
6. Marine vessels equipped with VHF radios are required to monitor Channel 16.
64


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