Garmin GTN 625Xi, Pilot'S Manual

Page: 373 / 534

Hazard Awareness
190-02327-03 Rev. C Pilot’s Guide 5-65
TILT
Use antenna tilt to locate the top and bottom of storm cells and to increase intensity
of ground target returns. One degree of tilt equals 100 feet of altitude per nautical
mile.
Basic Antenna Tilt Setup
Altitudes between 2,000 and 30,000 ft AGL:
•
Avoid target returns at 5 nm. These may be either weather or ground returns
that are 2,000 ft or less below the aircraft.
•
Raise the antenna tilt 4º to separate ground returns from weather returns in flat
terrain. Return the antenna to the previous setting after a few sweeps of the
radar.
•
Set the display range to 60 nm for aircraft flying at 15,000 ft or lower. Monitor
ground returns for possible threats.
Altitudes above 29,000 ft:
Be cautious of targets 30 nm or closer. This may indicate a thunderstorm that the
aircraft cannot fly over safely.
In a typical tilt setup, the bottom of the radar beam is adjusted
to 4º below parallel with the ground. To achieve this:
1. Fly the aircraft level.
2. Adjust antenna tilt so ground returns display at a distance
equal to the aircraft’s current altitude (AGL) divided by 1,000.
Remember the following points when flying with the antenna at
this basic angle setting.