Garmin GDL 30 Owner's Manual - Page 15

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Garmin GDL 30 Owner's Manual
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Pressure

This feature displays pressure isobars and pressure centers on the chartplotter's 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 (mb), Inches of Mercury (in), and Hectopascals (hPa). See the chartplotter's Owner's Manual for more information.
Pressure Isobars
Strong Pressure Gradient
GDL 30/30A Owner's Manual