Garmin GPSMAP 400 Weather and XM Satellite Radio - Manual (Page 11)

XM WX Satellite Weather and Cellular Weather
GPSMAP 400/500 Series Weather Supplement 7
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 Wind Direc-
tion
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
➊
, as shown in the legend
➋
on the left of the
screen.
➋
➌
➊
➍
The wave period indicates the time (in seconds) between successive waves.
Wave period lines
➌
indicate areas that have the same wave period.
Wave directions appear on the chart using red arrows
➍
. The direction of
each arrow pointer indicates the direction in which a wave is moving.