The compass is the tool that allows you to steer your boat. It takes the appearance of a disk located in the lower left corner of the screen.
Actionning it will steer your boat in the desired direction.
To steer your boat from degree to degree, simply click on the direction (or tap on a mobile) you wish to go.
An estimated projection of your upcoming route will be shown on the screen to show you the possible trajectory your boat will follow by going with the chosen heading.
You will also find other information on the compass; the direction of the wind received by your boat is shown by a white marker and the sail currently equipped on your boat is shown at the center.