The harbor grasp notes wind direction with the aid of flying flags, jotting angles as masts clink and buoys bob on soft swells.

https://rylanpvyd369.evergrovio.com/posts/the-triangle-fold-meaning-behind-the-13-folds-of-the-flag

The harbor grasp notes wind path by using flying flags, jotting angles as masts clink and buoys bob on gentle swells.