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Heading Line Adjustment:
the Heading Line is used to make sure
the green heading line (zero point) on your radar display is lined up the
bow of your vessel.
Heading Up
: when your heading is displayed at the top of the screen,
you are in Heading Up mode.
Interference Rejection
: filters out signals from other radars close to
your location.
North Up
: when North is set at the top of the radar display, you are in
North Up mode.
Offset EBL
: an electronic bearing line originating from a location other
than the PPI sweep origin.
Offset Mode:
moving the sweep origin (center of the PPI) to a location
other than the center of the radar display.
Open Array Antenna
: a radar antenna which has an external rotat-
ing scanner.
PPI (Plan Position Indicator)
: The PPI provides a map-like repre-
sentation of target echoes.
Radar Overlay
: radar display images laid over an electronic chart.
Radome
: a single housing containing a radar antenna and transceiver.
Rain Clutter
: undesirable echoes caused by rain or snow.
Range
: distance to a particular target.
Range Rings
: fixed rings on the radar display designed to show the
distance from the antenna.
Sea Clutter
: undesirable returns caused by smaller waves and water
movement.
Standby
: radar mode that follows warm-up and precedes the start of
transmission.
Sweep Origin
: the origin of EBL and VRM, the sweep origin is located
at the center of the PPI.
Target
: an item picked up by a radar.
Target Acquisition
: process of locking on and starting to track a tar-
get with an ARPA radar.
Time Base
: line that rotates around the radar display, updating im-
ages on the display.
