Raymarine Ray230 Owner's Handbook Manual page 12

Glossary of Terms
All Scan ........................... Scans all channels
ATIS ................................ Automatic Transmission Identification
Canadian Channels ......... Channel designator as defined by Industry
Carrier Wave ................... A Radio Frequency on which intelligence is
DSC ................................. Digital Selective Calling
Dual Watch ..................... Monitor channel 16 while working on another
Duplex ............................. Transmit and receive on different frequencies
ETSI ................................ European Telecommunications Standards
FM .................................. Frequency Modulation
International Channels .... Channel designator as defined by the ITU
ITU .................................. International Telecommunications Union
LCD ................................. Liquid Crystal Display
Memory Scan .................. Scans only user selected memory channels
MMSI .............................. Maritime Mobile Service Identity; a number
NOAA ............................. National Oceanographic and Atmospheric
PTT switch ...................... Microphone push-to-talk switch
RF .................................... Radio Frequency
RTCM .............................. Radio Technical Commission for Maritime
RX ................................... Receiver
Simplex ............................ Transmit and receive on the same frequency
Squelch ........................... A circuit that sets the threshold for cutting off
TX ................................... Transmit
US Channels ................... Channel designations as defined by the FCC
VHF ................................. Very High Frequency 30MHz to 300MHz
Weather Channels ........... Channels for routine and emergency weather
System; used for inland waterways in some
European countries
Canada
superimposed.
channel
Institute
issued by each country to identify maritime
stations.
Administration
Services
the receiver when the signal is too weak for
reception of anything but noise
information broadcast by NOAA
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