What are the zones of time in the collision of vessel?

1. First zone – all time up to the moment when risk of collision begins.

Note: One vessel is a privileged vessel and the other is a vessel required to take action to avoid collision.

2. Second zone – time between moment when risk of collision begins and moment it becomes practically a certainty.

Note: In this zone, the conduct of the vessels are primordial. It is in this zone that vessels must observe nautical rules, unless a departure therefrom becomes necessary to avoid imminent danger. The vessel which does not make such strict observance is liable.

3. Third Zone – time when collision is certain and up to the time of impact. Note: An error at this point no longer bears any consequence.