Garmin GPSMAP 740 Podręcznik uzupełniający - Strona 8
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XM WX Satellite Weather and XM Satellite Radio
Viewing a Marine Forecast or an Offshore Forecast
1. From the Home screen, select
2. Pan the map to an offshore location.
3. Touch a location on the chart.
The Marine Forecast or offshore Forecast options appear when forecast information is
available.
Marine Forecast
4. Select
Weather Fronts and Pressure Centers
Weather fronts appear as lines that indicate the leading edge of an air mass.
Front Symbol
Pressure-center symbols often appear near weather fronts.
Pressure
Description
Center
Symbol
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.
City Forecasts
City forecasts appear as standard weather symbols. The forecast is viewed in 12-hour increments for
the next 48 hours.
Weather
fronts
Weather
> Forecast.
offshore
Forecast.
or
Description
Cold front
Warm front
Stationary front
Occluded front
Trough
700 Series XM WX Satellite Weather
City forecasts
and XM
Satellite Radio Supplement
®
®