Abbreviations
3-cm 3-centimeter wavelength, approximately 9.4 GHz
10-cm 10-centimeter wavelength, approximately 3.0 GHz
ARPA Automatic Radar Plotting Aid
ATA Automatic Tracking Aid
BW Beamwidth
CBD
dB decibels
dBd Antenna Gain (dB) compared with dipole antenna
dBi Antenna Gain (dB) compared with isotropic antenna
dBmW Milliwatts in decibel form
dBW Watts in decibel form
DC Duty Cycle, also Direct Current
ECDIS Electronic Chart Display and Information System
EIRP Equivalent Isotropic Radiated Power
ENC Electronic Nautical Chart
EPA Electronic Plotting Aid
ERP Effective Radiated Power
FCC Federal Communications Commission
GHz Gigahertz, 1* 109 Hz
GPS Global Positioning System
H/V Horizontal/Vertical
HBW Horizontal beamwidth
HSC High Speed Craft (an IMO designation)
Hz Hertz
IALA International Association of Marine Aids to Navigation and Lighthouse Authorities
ICAO International Civil Aeronautical Organization
IEC International Electrotechnical Committee
IFM Instantaneous Frequency Measurement
IMO International Maritime Organization
ITU International Telecommunications
kW kilowatt(s)
LCD Liquid Crystal Display
MARPA Mini-ARPA
MHz Megahertz, 1*106 Hz
MNR(s) Marine Navigation Radar(s)
mW milliwatts
NMEA National Marine Electronics Association
NRL United States Naval Research Laboratory
PD Pulse Duration
PI Pulse Interval
PPI Plan-position Indicator
PRF Pulse Repetition Frequency
PRI Pulse Repetition Interval
RADAR Radio Aid to Detection And Ranging
Range-base Greatest Common Denominator for all mode-specific inter-pulse intervals
RF Radio Frequency
RPM Revolutions Per Minute
SOLAS Safety Of Life At Sea
VBW Vertical beamwidth
VDU Visual Display Unit
VHF Very High Frequency (defined by ITU as 30-300 MHz)