Garmin G3X Touch Pilot's Manual page 226

Hazard Avoidance
When winds aloft data is zoomed out, the wind barbs are displayed as general wind
trend lines. This removes the magnitude of the wind speed, but shows general trends.
S p
urFaCe reSSure
This feature displays pressure isobars and pressure centers. The isobars connect
points of equal pressure. Pressure readings can help determine weather and wind
conditions. High pressure areas are generally associated with fair weather. Low
pressure areas are generally associated with clouds and the chance of precipitation.
Isobars that are packed closely together show a strong pressure gradient. Strong
gradients are associated with areas of stronger winds. Pressure units can be displayed
in Millibars (mb) or Inches of Mercury (in).
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Wind Lines
Garmin G3X Touch Pilot's Guide 190-01754-00 Rev. L