Garmin GXM 30A User Manual download pdf (Page 20)

13 GXM 30A XM Radio Smart Antenna Owner’s Manual

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 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).

Strong Pressure Gradient

Pressure Isobars

XM Weather features > surface Pressure

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Garmin GXM 30A User Manual Page 20