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Frequency deviation range : The range of variation of the Q0N frequency used for transmission waves of a
solid-state radar. Generally, the greater the frequency deviation range, the
higher the resolution in the range direction.
Hydrographic and Oceanographic Department :
Hydrographic and Oceanographic Department of Japan Coast Guard. Publisher of ENC
Import (Chart Maintenance) : A procedure of enabling the chart supplied by Base CD to be displayed on
ECDIS
Interswitch Unit : A device to switch over two or more radar display units and two or more radar
antennas
Leg : Line between two consecutive waypoints
Lost AIS target : A target symbol representing the last valid position of an AIS target before the
reception of its data was lost, or its last dead-reckoned position.
Lost tracked target : One for which target information is no longer available due to poor, lost or
obscured signals.
Power amplifier : A radio frequency amplifier circuit consisting of semiconductor elements used
for solid-state radars. It employs a high frequency, high power FET.
Primary : Main positioning sensor
Pulse compression : Correlation processing performed when a transmitted chirp signal is received
by a solid-state radar after reflecting off the target. This processing gain
enables the radar to have necessary detection capability even when a
transmission power is low.
Radar beacon : A navigation aid which responds to the radar transmission and generates
radio wave
Range : An area of the chart displayed on the screen. Represented by one half of the
length of the chart display screen.
Reference target : A fixed target specified to calculate the speed over the ground
Report : User report to be issued periodically for using the Dynamic License method of
Jeppesen continuously
Rubber band : Border that indicates the selected range.
RIF : Radar Interface Circuit(Option interface board in Junction Box)
Scale : The display scale
Sea state : Status of the sea condition due to the weather environment, expressed as a
sea state 0 for flat conditions with minimal wind, to sea state 8 for very rough
sea conditions.
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