Fig. 2
From: Compensation for wind drift prevails for a shorebird on a long-distance, transoceanic flight
Circular framework for classifying in-flight behaviors using the direction of the wind flow (\(\hat{w}\); shown with tolerance value in blue), the range of the preferred direction (\(\left[ {\hat{d}_{w} ,\hat{d}_{e} } \right]\); shown with tolerance value in yellow), and the direction of realized movement of the bird (\(\hat{r}\); shown as black arrow). Angular differences (θrw, θrd θdd) are used to determine the “closeness” of the directions (i.e., if they are approximately similar)