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Furuno FM-4721 Manual

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AP-1
APPENDIX 1 CHANNEL ASSIGN-
MENTS, MENU TREE
Channel Assignments
This chapter provides the VHF Marine Channel assignments for U.S.A. and International use. Be-
low are listed some data about the charts.
1. Channels indicated as VTS 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 counter-
parts in the International assignments are duplex channels. International channels do not use
alpha numbers. If you call the Coast Guard on CH16, they may ask you to "go to channel 22
Alpha." This is a channel assigned to the U.S.A, and Canadian Coast Guards for handling dis-
tress and other calls. If your radio is set for International operation, go to Channel 22 instead
of 22A, 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 com-
bination 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 oth-
ers "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
specified for these channels.
4. The S/D column on the chart indicates either S (simplex) or D (duplex). Simplex means trans-
mitting and receiving on the same frequency. Only one party at a time can talk, unlike a tele-
phone. Be sure to say "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
the other 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. 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-commer-
cial" 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.
6. Marine vessels equipped with VHF radios are required to monitor CH16.
VHF marine channel chart
CH U C I S/D TX RX Channel use
01 X X D 156.050 160.650 Public Correspondence (Marine Operator)
01A X S 156.050 Port Operation and Commercial.
VTS in selected areas
02 X X D 156.100 160.700 Public Correspondence (Marine Operator)
03 X X D 156.150 160.750 Public Correspondence (Marine Operator)
03A* X S 156.150 U.S. Government Only, Coast Guard
04 X D 156.200 160.800 Public Correspondence (Marine Operator),
Port operation, ship movement
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