Garmin G500 Pilots Guide - Page 198
Weather Mapping and Interpretation
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Foreword System Sec 1 PFD Sec 2 MFD Sec 3 Features Avoidance Hazard Sec 4 Additional Sec 5 to 30 NM or closer. This is likely a thunderstorm that has a top high enough that the aircraft cannot fly over it safely. If the aircraft altitude is 15,000 feet or lower, set the displayed range to 60 NM. Closely monitor anything that enters the display. Also, after setting up the antenna tilt angle as described previously, ground returns can be monitored for possible threats. The relationship between antenna tilt angle, altitude, and distance is one degree of tilt equals 100 feet of altitude for every one nautical mile. Vertical Change of Radar Beam (feet) Change in Antenna Tilt +4° +3° +2° +1° 0° -1° -2° -3° -4° 10 nm 4000 3000 2000 1000 0 1000 2000 3000 4000 Figure 4-60 Vertical Change in Radar Beam per Nautical Mile Therefore, with the antenna tilt set so that the bottom of the beam is four degrees below parallel with the ground, a target return at 10 NM is approximately 4,000 feet below the aircraft; at 20 NM, 8,000 feet; at 50 NM, 20,000 feet. In other words, at this tilt setting, a ground return (such as a mountain peak) being displayed at 10 NM would have a maximum distance below the aircraft of 4,000 feet. If that ground target return moves to 5 NM, maximum distance below the aircraft will be 2,000 feet. This setup will provide a good starting point for practical use of the GWX 68. There are many other factors to consider in order to become proficient at using weather radar in all situations. 4.8.5 Weather Mapping and Interpretation 4.8.5.1 Weather display Interpretation When evaluating various target returns on the weather radar display, the colors denote approximate rainfall intensity and rates as shown in the table below. & Alerts Annun. Sec 6 Symbols Sec 7 Appendix A Glossary Sec 8 Index Appendix B 4-70 Garmin G500 Pilot's Guide 190-01102-02 Rev. B