Bedienungsanleitung Standard Horizon MATRIX AIS GX2000 (Seite 120 von 136) (Englisch)

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GX2000/GX2100Page 120

19 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 Cana-

dian 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. Chan-

nel 22 (without an “A”) is an International duplex channel for port opera-

tions. Some radios indicate an “A” adjacent to the alpha channels on the

display; on others “alpha” is not indicated but the proper channel is se-

lected 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 17 for additional information.

4. The S/D column on the chart indicates either S (simplex) or D (duplex). Sim-

plex 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 transmission. Duplex op-

eration involves the use of one frequency for transmitting and a separate fre-

quency 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.

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