CR44/54 Glossary of terms Appendix A-5
HU – Head-Up The heading line always appears on the display at 0 degrees
as the antenna passes the bow of the vessel. Targets appearing on the display
are relative to your own ship’s position and heading.
IR – Interference Rejection.
Navigation points - approaching + next navigation point can be shown on the
radar display when operating in navigation mode.
NU – North-Up In this mode, targets are displayed at their measured dis-
tances in true direction from your boat. North being at the top of the display.
In the North-Up mode, you must be interfaced with an electronic compass for
proper operation.
Off-Center mode - lets you position the origin own ship to any point on the
screen within 66% of the radius of the display (the center 2/3 of the display).
The Off-Center mode permits the operator to obtain a greater view in the
direction of interest.
PLOT function – will require that a heading sensor (Gyro or Compass) is
connected to the CRXX. If so, then you can plot the actual cursor position
on the radar display by pressing the [PLOT] key from the radar display, and
thereby save the position in the WP-list as a waypoint i.e. you can give the
plotted waypoint a new name/number, symbol, color, etc.
PPI center – Plan Position Indicator (center of screen).
RAIN CLUTTER Control – also known as Fast Time Constant (FTC), is
used to reduce large clutter masses caused by rain or snow and allow targets
masked by this clutter to be seen on the radar display. This control differenti-
ates the multitude of small radar returns from rain, effectively reducing or
eliminating the rain clutter and allowing the operator to observe larger vessel
traffic within the rain clutter. It has the effect of only displaying the leading
edge of large echoes and will tend to effect the smaller echoes only slightly.
This can be of great advantage on shorter ranges to distinguish between two
very close echoes on the same bearing which may otherwise merge and appear
as one echo.
Relative Motion Land, buoys and fixed objects move past own ship. In the
North-Up mode, you must be interfaced with an electronic compass for proper
operation.
SEA CLUTTER Control – also known as the Sensitivity Time Control
(STC), is normally used on the shorter ranges to suppress the effects of sea
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