Manual Standard Horizon HX 870E (page 122 of 140) (English)

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Page 122 HX870

18 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 Trafc 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 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 specied for these

channels.

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 specied 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

geographic regions.

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Standard Horizon HX 870E Manual

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