Navigating a giant vessel is not at all an easy job and when it comes to situations of emergency, wherein the navigational officer has to make some quick decisions, the safety of the entire ship and its crew depends on that officer.
BNWAS is one type of automated system used on ships. While the navigation of the ship is probably the most important aspect of delivering the cargo and the crew safely between two points, it must also be understood that the human component
attached to navigation is open to errors and faults; with a sudden mishap for the watch keeper (sudden unavailability due to health reasons while on duties), the ship might be exposed to dangers and the BNWAS assists to tackle such a problem.