Honeywell IntuVue RDR-4000 Pilot's Manual page 17

IntuVue RDR-4000 Weather Radar Pilot's Guide
ALL/ ALL WX WEATHER
Select the ALL/ALL WX mode to display both on path and off path
weather. The off path weather is displayed with black stripes through
it. (See diagram on page 34.)
This mode is useful for situational awareness and to aid in making
changes to your flight plan to avoid on path weather. See the following
examples to visualize the displayed weather.
UNDERSTANDING THE DISPLAY IN ALL/ALL WX AND ON PATH/
PATH WX MODES
In ALL/ALL WX or ON PATH/ PATH WX mode, the RDR-4000 projects
a three dimensional memory space onto a two dimensional display.
This means the weather displayed for any one memory cell is the color
of the strongest return in that column of memory cells. Specifically, if
there is any weather data in a given column that is inside the envelope
for on path weather; the color of the strongest of these returns is
displayed. If there is no weather data inside the envelope, then the
color of the strongest return from outside the envelope is displayed as
off path weather.
Stronger returns outside the envelope (off path weather) never override
the returns displayed as on path weather.
D201002000008 Expanded Operating Instructions
Rev 1, December 2014 13