Look at the race marks and committee boat to see the direction and speed of the tidal stream.
观察⽐赛标志和组委会船,以判断潮流的⽅向和速度。
Waves 波浪
You will rarely have flat water if sailing on the sea or a large body of inland water. To use the waves, use body movement (balance), steering and trim to harness or cancel the extra force of waves.