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
20 knots
50 knots
65 knots
Wave Height, Wave Period, and Wave Direction
Wave heights for an area appear as variations in color.
Different colors indicate different wave heights, as shown
in the legend.
The wave period indicates the time (in seconds) between
successive waves. Wave period lines indicate areas that
have the same wave period.
Wave directions appear on the chart using red arrows.
The direction of each arrow pointer indicates the direction
in which a wave is moving.
Viewing Forecast Sea Conditions Information for
Another Time Period
1
Select
Charts
>
Sea Conditions
.
2
Select an option:
• To view forecasted sea conditions for the next 36
hours, in 12-hour increments, select
multiple
times.
• To view the forecasted sea conditions for the
previous 36 hours, in 12-hour increments, select
multiple times.
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SiriusXM Weather
