Garmin Aera 660 Pilot's Manual page 134

Hazard Avoidance
An abbreviated version can be viewed by selecting the METAR flag with the map
pointer. Touching the Map Feature Button will display additional information. METAR
and TAF data can be displayed as raw or decoded text.
Map
METAR Data (Map)
Feature
Button
The METAR flag color is determined by the information in the METAR text.
VFR
Marginal VFR Ceiling 1000-3000 feet AGL and/or visibility 3-5 miles
IFR
Low IFR
METAR text does not contain adequate information to determine flight
conditions
118
Ceiling greater than 3000 feet AGL and visibility greater
than 5 miles
Ceiling 500 to below 1000 feet AGL and/or visibility 1 mile
to less than 3 miles
Ceiling below 500 feet AGL or visibility less than 1 mile
Garmin aera 660 Pilot's Guide
Additional METAR Data
190-02017-20 Rev. E