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Appendix I: Glossary
Anti-Rain Clutter (FTC): used to reduce or eliminate massive num-
ber of small echoes that clutter the display during rain or snow storms.
Anti-Sea Clutter (STC): lowers receiver sensitivity at shorter ranges
to reduce or eliminate sea clutter echoes, which are most prevalent
around the vessel.
Beam: focused rays of microwave energy
Beam width: measured in degrees, the width of a beam, both horizon-
tally and vertically.
Clutter: undesirable echoes created by rain, snow, waves and other
intermittent causes.
Course Up: a stabilized display mode in which the current user-
selected course is represented at the top of the radar display. This dis-
play mode requires a heading sensor.
EBL (Electronic Bearing Line): A radial line that can be rotated
360º, the electronic bearing line is used to monitor the bearing of a ra-
dar target in relation to your location.
Echo: reflected radio frequency pulse picked up by radar. It is also an-
other name for a target image detected on the radar display.
Echo trail: a history (trail) of the echoes for a particular radar target.
Gain: used to adjust the sensitivity of the receiver to increase or de-
crease the intensity of images on the display.
Ghost Echo: an undesirable image created when returns are reflected
off other structures.
Heading Flash: the green line on the radar display that shows the
direction you are heading.
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.