Honeywell IntuVue RDR-7000 Pilot's Manual page 19

IntuVueRDR-7000 Weather Radar Pilot's Guide
The RDR-7000 fills the 3D memory with all the detected weather in
front of the aircraft out to 320 nm, and from ground level up to
60,000 feet mean sea level (MSL). The RDR-7000displays weather
within the flight path envelope using solid colors. This is ON PATH
weather. All other weather is considered to beOFF PATH weather.
Select the WX ALL 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 40.)
When in the WX PATH mode, only the On Path weather is displayed.
Note that while the use of the internal topographical information
results in a significant reduction in ground returns, the radar is not
aware of man-made reflectors such as buildings at airports and in
cities. Therefore, it is possible that not all ground clutter will be
eliminated from the weather display.
There are several potential sources of false weather indications,
including RF interference sources external to the aircraft, anomalous
signal propagation due to atmospheric conditions, strong returns
from urban areas and mountainous regions, and others. Before
making operational decisions based on small isolated indications on
the weather display, the validity of these indications should be
verified via PIREPS, ground-based weather sources and/or ATC
communications.
D201911000094 Expanded Operating Instructions
Rev 0, Feb 2020 17