Garmin GPSMAP 4210 Owner's Manual - Page 65

Viewing Sea Conditions, Understanding Fronts

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Using XM Understanding Fronts The Fronts show lines indicating the leading edge of an air mass. This feature also shows pressure centers. Cold Front Warm Front Stationary Front Occluded Front Trough 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 lowpressure center in any horizontal direction results in increased pressure. Winds flow counterclockwise around low-pressure centers in North America. Indicates a high-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. Understanding City Forecasts City forecasts appear as standard weather symbols. The forecast is viewed in 12-hour increments for the next 48 hours. Viewing Sea Conditions Sea Conditions provide surface conditions including winds, wave height, wave period, and wave direction. From the Home screen, select Weather > Sea Conditions. GPSMAP 4000 Series Owner's Manual 61 Using XM

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GPSMAP 4000 Series Owner’s Manual
³±
Using XM
U
SING
XM
Understanding Fronts
The Fronts show lines indicating the leading edge of an air mass. This feature also shows pressure
centers.
Cold Front
Warm Front
Stationary Front
Occluded Front
Trough
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. 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.
Understanding City Forecasts
City forecasts appear as standard weather symbols. The forecast is viewed in 12-hour increments for
the next 48 hours.
Viewing Sea Conditions
Sea Conditions provide surface conditions including winds, wave height, wave period, and wave
direction.
From the Home screen, select
Weather
>
Sea Conditions
.