Garmin GXM 40 - Manual (Page 16)

4 GXM 40 Owner’s Manual
XM WX Weather Features
Winds
Winds Aloft
Aviation units display winds 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. Arrows indicate the direction of the wind
streamline.
Wind Barbs Wind Streamline Wind Barbs Wind Streamline