Garmin GXM 30A - Manual (Page 19)

GXM 30A XM Radio Smart Antenna Owner’s Manual 
Winds Aloft
Aviation units display winds aloft using wind barbs or a wind streamline depending on the zoom range of the map. Similar to
Marine and Automotive units, the wind barbs indicate wind speed and direction. The wind streamline indicates wind direction with
arrows.
XM W
eather
f
eatures
> W
Inds
a
loft
Wind Barbs Wind Streamline