update content:
1. The factors that affect the maximum speed are described in detail in the speeding notes of the sailing interface.
2. Added multiple annotations on the sailing interface.
3. Added multiple annotations on the city interface.
update content:
1. The factors that affect the maximum speed are described in detail in the speeding notes of the sailing interface.
2. Added multiple annotations on the sailing interface.
3. Added multiple annotations on the city interface.