Garmin G1000:Socata Pilot's Manual page 324

HAZARD AVOIDANCE
To display the Surface Analysis and City Forecast legend, select the LEGEND Softkey when Surface
Analysis and City Forecast are selected for display.
FREEZING LEVEL
Freezing Level data shows the color-coded contour lines for the altitude and location at which the first
isotherm is found. When no data is displayed for a given altitude, the data for that altitude has not been
received, or is out of date and has been removed from the display. New data appears at the next update.
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Figure 6-27 Surface Analysis Legend
Figure 6-28 Freeze Level Data
Garmin G1000 Pilot's Guide for the Socata TBM 850 190-00709-00 Rev. A