Garmin G300 Pilot's Manual page 156

hazard avoidance
METARS AND TAFS
nOte: METAR information is only displayed within the installed aviation
database service area.
METAR (METeorological Aerodrome Report) is an international code used
for reporting weather observations. METARs are updated hourly or as needed.
METARs typically contain information about the temperature, dewpoint, wind,
precipitation, cloud cover, cloud heights, visibility, and barometric pressure. They
can also contain information on precipitation amounts, lightning, and other critical
data. If METAR data is available for an airport, a color-coded flag is shown next
to the airport.
TAF (Terminal Area Forecast) is the standard format for 24-hour weather
forecasts. TAFs may contain some of the same code as METAR data. It typically
forecasts significant weather changes, temporary changes, probable changes, and
expected changes in weather conditions.
METAR and TAF text data is displayed on the Map Page and the Weather (WX)
Page. An abbreviated version can be viewed by panning over the METAR flag.
Pressing the ENT Key will display additional information. METAR and TAF data
can be displayed as raw or decoded text.
Changing METAR and TAF text:
1) Using the Map Pointer, select the desired METAR and press the ENT
Key; or from the Waypoint (WPT) Page press the WEATHER Softkey.
The Weather Information Page is displayed.
2) Press the MENU Key.
a) Select 'Show Decoded Text' or 'Show Raw Text'.
b) Press the ENT Key.
Or:
a) Select 'Change Text Size' and press the ENT Key.
b) Select 'Small', 'Medium', or 'Large' and press the ENT Key.
The METAR flag color is determined by the information in the METAR text.
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Garmin G300 Pilot's Guide 190-00921-00 Rev. D