Glossary AM
Amplitude Modulation: superimposing an audio signal onto a radio wave| by varying the amplitude of the radio “carrier” wave
amplitude
the extent to which the voltage fluctuates in the electric field that makes up a radio wave, analogous to the “height” of a wave in water.
antenna
Authority to Operate
broadcasting
channel numbers
declaration of conformity
distress situation
doppler positioning DSC Dual Watch aerial
licence for a person to operate a VHF radio
transmitting a message without specifying who it is intended for
simple numerical identification of ITU standard frequencies
certification that radio conforms to performance standards
vessel, vehicle, aircraft or person in grave and imminent danger
using an apparent change in the
frequency of the signal from a moving object to calculate position
Digital Selective Calling
facility for radio to monitor Channel 16 and another channel concurrently
duplex channels two-way, two-frequency operation EPIRB
FM
Emergency Position Indicating Radio Beacon
Frequency Modulation: superimposing a audio signal onto a radio wave by varying the frequency of the radio “carrier”.
frequency gain
speed of voltage changes in radio waves transmitted, in Hertz
the factor by which an antenna increases effective radiated power or received signal strength, compared with a standard reference antenna
GMDSS guard band
IMO ITU
Global Maritime Distress and Safety System
restricted channels closest to Channel 16
International Maritime Organisation
International Telecommunication Union
safety calls SAR SART link call Mayday
call between ships & public telephones via coast radio stations
distress call
Mayday Relay passing on a distress message MCA or MCGA Maritime and Coastguard Agency MMSI
Maritime Mobile Service Identity number
modulation
MRAA MSI
Navtex
Ofcom Panpan
superimposing a signal onto a radio “carrier” wave
Maritime Radio Accounting Authority Maritime Safety Information
Navigation Teletext for weather forecasts and navigational warnings
Office of Communications urgency call requesting assistance
private channels for governments to allocate as they think fit
prowords PTT switch
correct words to use as part of radio procedure
switch pressed to transmit (Press-To-Talk)
calls relating to weather forecasts and navigational warnings
Search And Rescue Search And Rescue Transponder
scanner mode facility for radio to monitor a number of channels in quick succession
Securitay seelonce
Procedure word identifying a safety call
radio silence (French) requested during distress incident
simplex channel single-frequency channel SOLAS squelch
SRC Tri Watch urgency call VHF wavelength Short Range Certificate
facility for radio to monitor Channel 16 and two other channels
call requesting assistance which does not justify Mayday call
Very High Frequency distance between radio waves Safety of Life at Sea Convention
control regulating the sensitivity of a receiver
VHF Handbook
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