Garmin GDU 37X Pilot's Manual page 146

Hazard Avoidance
WINDS ALOFT
Winds Aloft data shows the forecasted wind speed and direction in 3,000-foot
increments up to 39,000 feet MSL.
Winds Aloft are displayed using wind barbs or a wind streamline depending on
the selected range. The wind barbs indicate wind speed and direction. The wind
streamline indicates wind direction with arrows.
The wind barbs always point in the direction that the wind is coming from. The wind
speed is depicted using flags at the end of the wind barb. A short wind flag is 5 knots,
a long wind flag is 10 knots, and a triangle flag is 50 knots.
128
FIS-B Radar (Combined)
Garmin GDU 37X Pilot's Guide
™
190-01054-00 Rev. E