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What is essential for avoiding collisions at sea?

  1. Using radar only

  2. Early and substantial action

  3. Ignoring other vessels

  4. Sailing at maximum speed

The correct answer is: Early and substantial action

Radar can definitely help in identifying other vessels on the sea, but it is not the only essential factor in avoiding collisions. Ignoring other vessels can lead to serious accidents and is definitely not a recommended way of avoiding collisions. Sailing at maximum speed can make it harder to maneuver and avoid collisions in time. Therefore, early and substantial action, such as slowing down or changing course, is essential for avoiding collisions at sea. It allows for enough time to make necessary adjustments and avoid accidents.