The harbor grasp notes wind direction by means of flying flags, jotting angles as masts clink and buoys bob on delicate swells.

https://beaummik165.wordcanopy.com/posts/why-does-the-american-flag-have-13-stripes-exploring-colonial-roots

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