Measurements of shipboard wind speed (m s–1) at the 25 m height of the ship’s mast are plotted against time, showing the average and ± 1 standard deviation for the sampling period (8.6 ± 3.5 m s–1; n = 6500) as three horizontal lines. Wind speeds ranged from 0.2 to 18.9 m s-1. The average dropped to 7.9 ± 3.2 m s-1 when corrected to 10 m height. Gaps indicate transits into sea ice-covered regions.