When passing through a boat lock which lock means approach the lock under full control?

When approaching a boat lock, the term "approach the lock under full control" refers to the need for the vessel to be maneuvered carefully and at a safe speed to ensure safety for both the boat and the lock infrastructure. This means the captain should be prepared to stop or adjust the vessel's position as necessary, maintaining awareness of the lock's operations and any other vessels present. It is crucial for preventing collisions and ensuring a smooth passage through the lock.