Garmin GTN 750 Pilot's Guide - Page 256

Foreword Getting Started Audio & Xpdr Ctrl Com/Nav 2. Repeated touches to the NEXRAD key will toggle between the Off, US, and Canada selections. FPL Direct-To Proc Charts Wpt Info 12.1.5.1 Figure 12-8 NEXRAD Weather Legend Reflectivity Map Reflectivity is the amount of transmitted power returned to the radar receiver. Colors on the NEXRAD display directly correlate to the level of detected Traffic reflectivity. Reflectivity as it relates to hazardous weather can be very complex. The role of radar is essentially to detect moisture in the atmosphere. Simply Terrain put, certain types of weather reflect radar better than others. The intensity of a Weather radar reflection is not necessarily an indication of the weather hazard level. For instance, wet hail returns a strong radar reflection, while dry hail does not. Both Nearest wet and dry hail can be extremely hazardous. The different NEXRAD echo intensities are measured in decibels (dB) relative Music to reflectivity (Z). NEXRAD measures the radar reflectivity ratio, or the energy reflected back to the radar receiver (designated by the letter Z). The value of Z Utilities increases as the returned signal strength increases. System Messages Symbols Appendix Index 12-10 Garmin GTN 725/750 Pilot's Guide 190-01007-03 Rev. B