Wind

Wind is a game mechanic serving as the means of applying meaningful speed to a player ship's movement.

Mechanics
Any player on board a Ship will be able to see the wind blowing as a gentle, wavy semi-transparent white lines.

Flags being flown will also flap in the wind according to the wind's direction.

Being aware of the wind's direction is a crucial part of sailing, as it affects the overall speed of the vessel.

Sails & Speeds
Kiwhen on YouTube did his research on the different Speeds of different Sail placements with different wind directions:

Trivia

 * The direction of the Wind is always the same for a single server.