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GDL 30A Owner’s Manual 13
Pressure
The pressure feature displays pressure isobars and pressure centers on the map. The isobars connect points of equal pressure. Pressure readings
can help determine weather and wind conditions in an area. 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 pressure gradients are associated with areas of stronger winds.
Pressure units can be displayed in millibars (mbar), inches of mercury (in Hg), and hectopascals (hPa). See the chartplotter Owner’s Manual for
more information on conguring units of measure.
Strong Pressure Gradient
Pressure Isobars
XM WX Weather Features