Viewing a Marine Forecast or an Offshore Forecast
1
Select
Charts
>
Forecast
.
2
Pan the chart to an offshore location.
The Marine Forecast or Offshore Forecast options
appear when forecast information is available.
3
Select
Marine Forecast
or
Offshore Forecast
.
Viewing Forecast Information for Another Time Period
1
Select
Charts
>
Forecast
.
2
Select an option:
• To view the weather forecast for the next 48 hours,
in 12-hour increments, select
multiple times.
• To view the weather forecast for the previous 48
hours, in 12-hour increments, select
multiple
times.
Weather Fronts and Pressure Centers
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 flow
counterclockwise around low-pressure
centers in the northern hemisphere.
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 flow
clockwise around high-pressure centers in
the northern hemisphere.
City Forecasts
City forecasts appear as weather symbols. The forecast is
viewed in 12-hour increments.
Symbol Weather
Fair (sunny, hot, clear)
Partly cloudy
Cloudy
Rain (drizzle, sleet, showers)
Thunderstorms
Windy
Smoke (dusty, hazy)
Foggy
Snow (snow showers, flurries, blizzard, blowing
snow, sleet, freezing rain, freezing drizzle)
Viewing Fish Mapping Data
NOTE:
This feature requires a GXM 54 antenna and a
SiriusXM Fish Mapping
™
service subscription.
The Fish Mapping weather chart shows information that
can help you locate fish species.
1
Select
Charts
>
Fish Mapping
.
2
If necessary, select
Options
>
Layers
, and turn on
and off information.
Viewing Sea Conditions
The Sea Conditions feature shows information about
surface conditions, including winds, wave height, wave
period, and wave direction.
Select
Charts
>
Sea Conditions
.
Surface Winds
Surface wind vectors appear on the Sea Conditions chart
using wind barbs that indicate the direction from which the
wind is blowing. A wind barb is a circle with a tail. The line
or flag attached to the tail of the wind barb indicates the
wind speed. A short line represents 5 knots, a long line
represents 10 knots, and triangle represents 50 knots.
Wind Barb
Wind Speed
Calm
5 knots
10 knots
15 knots
74
SiriusXM Weather
