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

https://johnnylsio031.urbanvellum.com/posts/why-fly-historic-flags-honoring-their-memory-and-never-forgetting-history

The harbor master notes wind route through flying flags, jotting angles as masts clink and buoys bob on tender swells.