Garmin G3X Pilot's Manual page 204

Hazard Avoidance
Calm
5 Knots
10 Knots
SURFACE PRESSURE
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) and Inches of Mercury (in).
XM LIGHTNING
Lightning data shows the approximate location of cloud-to-ground lightning strikes.
A strike icon represents a strike that has occurred within a two-kilometer region
and within the last seven minutes. The exact location of the lightning strike is not
displayed.
186
Wind Direction
15 Knots
20 Knots
50 Knots
Winds Barbs
Other Legend
Garmin G3X Pilot's Guide
Wind Flag
Surface Pressure Data
190-01115-00 Rev. G