Suppressing Precipitation Returns; Presentation Mode - Furuno FR-7041R-MARK-2 Operator's Manual

1.12

Suppressing Precipitation Returns

The vertical beamwidth of the antenna is designed to see surface targets even
when the ship is rolling. However, by this design the unit will also detect rain
clutter (rain, snow, hail, etc.) in the same manner as normal targets. Figure 1-8
shows the appearance of rain clutter on the display.
When rain clutter masks echoes over a wide range, raise the A/C RAIN
setting slightly to distinguish targets from the clutter.
In heavy storms or partial clutter, push in the [A/C RAIN] control to activate the
FTC circuit. This circuit splits up unwanted echoes into a speckled pattern to
distinguish solid targets from the clutter. "FTC" appears at the bottom left corner
of the screen when the FTC circuit is active. Turn off the FTC when its use is not
required so that weak echoes will not be missed.
1.13

Presentation Mode

Use the [MODE] key to select the presentation mode among head-up, course-up,
north-up and true motion.
Loss of Heading Signal
When the heading signal is lost the
presentation mode automatically becomes
head-up and the HDG readout shows
xxx.x. Restore the heading signal, and
then press the [MODE] key to display the
heading readout.
Appearance of
A/C RAIN control adjusted
rain clutter
rain clutter suppressed
Figure 1-8 Rain clutter
1. OPERATION
1-9