Garmin GDL 30A Owner's Manual - Page 17
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Fronts
The Fronts feature displays the lines indicating the leading edge of an air mass that is replacing another. This feature also displays pressure centers. Pressure centers are
represented by a large Red "L" for low pressure centers or a large Blue "H" for high pressure centers. Pressure centers represent an area where pressure is measured to
be either the highest or lowest relative to the surrounding area.
Indicates a Low Pressure Center. A Low
Pressure Center is an area where the
measured pressure is lowest relative to the
surrounding area. Moving away from a Low
Pressure Center in any horizontal direction
results in increased pressure. Winds flow
counterclockwise around Low Pressure
Centers in North America.
Indicates a High Pressure Center. Similar
to a Low Pressure Center, a High Pressure
Center is an area where the measured pressure
is highest relative to the surrounding area.
Moving away from a High Pressure Center in
any horizontal direction results in decreased
pressure. Winds flow clockwise around High
Pressure Centers in North America.
GDL 30/30A Owner's Manual
Cold Front
Warm Front
Statonary Front
Occluded Front
Dry Lne
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