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Marine VHF radio
- Created 2012-02-15
Marine VHF radio
is installed on all large ships and most seagoing small craft. It is also used, with slightly different regulation, on rivers and lakes. It is used for a wide variety of purposes, including summoning
services and communicating with
s, and operates in the
very high frequency
(VHF) range, between 156 and 162.025
. Although it is widely used for collision avoidance, its use for that purpose is contentious and is strongly discouraged by some countries, including the UK.
A marine VHF set is a combined transmitter and receiver and only operates on standard, international frequencies known as
(156.8 MHz) is the international calling and distress channel.
can also be used in some places as a secondary call and distress channel. Transmission power ranges between 1 and 25 watts, giving a
of up to about 60
s (111 km) between
s mounted on tall ships and hills, and 5 nmi between aerials mounted on small
s at sea level.
(FM) is used, with vertical polarization, meaning that antennas have to be vertical in order to have good reception.
Modern-day marine VHF radios not only offer basic transmit and receive capabilities. Permanently mounted marine VHF radios on seagoing vessels are required to have certification of some level of "
Digital Selective Calling
" (DSC) capability, to allow a distress signal to be sent with a single button press.
Marine VHF mostly uses "
" transmission, where communication can only take place in one direction at a time. A transmit button on the set or microphone determines whether it is operating as a transmitter or a receiver. The majority of channels, however, are set aside as "
" transmission channels where communication can take place in both directions simultaneously. Each semi-duplex channel has two frequency assignments. Semi-Duplex channels can be used to place calls on the public
system for a fee via a marine operator. This facility is still available in some areas, though its use has largely died out. Marine VHF radios can also receive
broadcasts, where they are available.
from Wikipedia (last updated: 19 May), licensed under
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US Coast Guard basic radio information for boaters
Coast Guard marine channel listing (with frequencies)
US FCC marine channel listing (by function)
UK MCA advice on use of VHF at sea, including collision avoidance, effective ranges, and International channel usage
Canadian VHF Bands in the Maritime Service
VHF Marine Band Plan in TURKEY (Türkiye'deki VHF Deniz Telsiz Frekans Kanal Listesi)
Listen LIVE! VHF Marine Radio @ East of Izmit Bay / TURKEY (İzmit Körfezi Doğusu - Canlı VHF Marin Telsiz Dinleme)
New Zealand VHF Radio Resource Center
Australian VHF Radio Network locations and How to Make A Distress Call
Maritime mobile amateur radio
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