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.
Viewing Sea Temperature Information
The Sea Temperature weather chart shows the present water temperature and present surface pressure
conditions.
Select Charts > Sea Temperature.
SiriusXM Weather 151
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