How should ND weather radar and terrain overlays be used for situational awareness?

• A. Enable overlays, adjust range, interpret color-coded weather returns and terrain depiction to anticipate hazards.
• B. Disable overlays for a cleaner display.
• C. Only rely on speed readings.
• D. Ignore weather radar.

Answer: (A)

Using the ND overlays to fuse weather and terrain information with your aircraft’s position gives you proactive, real-time hazard awareness. Enabling the weather radar overlay and the terrain overlay on the ND keeps critical threats visible in your primary display rather than requiring you to flip between sources.

Adjusting the range is essential. A wider range shows approaching weather systems and terrain further ahead, giving you more time to anticipate changes in flight path, request deviation, or change altitude before reaching the hazard. A tighter range sharpens detail on weather cells or terrain you’ll encounter soon, which helps with precise maneuver planning.

Interpreting the color codes is the key to quick, accurate assessment. Weather radar uses a color spectrum to indicate echo intensity—lighter colors for light precipitation, progressing to stronger colors for heavier rain, storms, or cells that might produce turbulence or wind shear. Terrain overlays use colors to show relative elevation and clearance, so you can see at a glance whether terrain lies above or below your current flight level and how close you are to obstacles.

Using both overlays together lets you correlate storm tracks with terrain and terrain clearance with weather, supporting safer routing decisions and timely deviations if needed. Relying on a single source or ignoring overlays would reduce situational awareness and leave you without early warning of hazards.