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XM WX Satellite Weather and Cellular Weather
GPSMAP 400/500 Series Weather Supplement 5
Forecast Information
The Forecast chart shows city forecasts, marine forecasts, warnings,
hurricane warnings, METARS, county warnings, weather fronts and pressure
centers (XM data only), surface pressure, and WX buoys.
Viewing Present Forecast Information
From the Home screen, select > > .
Viewing Forecast Information for Another Time Period
This feature is available only if you are receiving XM WX Satellite
Weather data. It is not available if you are receiving only cellular weather
data.
1. From the Home screen, select > > .
2. Complete an action:
• To view the weather forecast for the next 12 hours, select right on the
, and to view forecasts up to 48 hours, in 12-hour increments,
select right on the again.
• To view the weather forecast for the previous 12 hours, select left on
the and to view previous forecasts, up to 48 hours ago, in 12-
hour increments, select left on the again.
Viewing a Marine Forecast or an Offshore Forecast
1. From the Home screen, select > > .
2. Select > .
3. Pan the chart to an offshore location.
The or options appear when
forecast information is available.
4. Select or .
Weather Fronts and Pressure Centers:
This feature is available only if you are receiving XM WX Satellite
Weather data. It is not available if you are receiving only cellular weather
data.
Weather fronts appear as lines that indicate the leading edge of an air mass.
Front Symbol Description
Cold front
Warm front
Stationary front
Occluded front
Trough
Pressure-center symbols often appear near weather fronts.
Pressure-
Center
Symbol
Description
Indicates a low-pressure center, which is a region of relatively
lower pressure. Moving away from a low-pressure center results
in increased pressure. Winds ow counterclockwise around low-
pressure centers in the northern hemispheres.
Indicates a high-pressure center, which is a region of relatively
higher pressure. Moving away from a high-pressure center
results in decreased pressure. Winds ow clockwise around
high-pressure centers in the northern hemispheres.