Standard-horizon HX-471S User Manual download pdf (Page 49)

HX471S Page 47

16. VHF MARINE CHANNEL ASSIGNMENTS

Tables on the following pages 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 Cana-

dian channel assignments whose counterparts in the International as-

signments are duplex channels. International channels do not use “al-

pha” numbers. If you call the Coast Guard on Channel 16, they will some-

times 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 Chan-

nel 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, using the USA/CAN/INTL channel selection proce-

dure described on page 28 of this manual. Channel 22 (without an “A”) is

an International duplex channel for port operations. The HX471S dis-

plays an “A” adjacent to the channel number on all “Alpha” channels,

unlike some other models that may not indicate the “A” even though they

may be set to the correct frequency.

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 ma-

rine vessels in the vicinity of these bridges for navigation and for com-

municating with the bridge operators. Note that a limit of 1 Watt is speci-

fied 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 trans-

mission. Duplex operation involves the use of one frequency for trans-

mitting and a separate frequency for receiving. On channels specified

as duplex on the charts, correct mode of operation is established auto-

matically 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

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 60 61

No comments

Standard-horizon HX-471S User Manual Page 49