Bridge Navigational Watch Alarm System (BNWAS) blev implementerat i the International Convention for the Safety Of Life At Sea (SOLAS) år 2009. Sedan dess har olika typer av fartyg haft längre eller kortare tid på sig att installera systemet ombord. Navigatörer har utryckt både positiva och negativa synpunkter på systemet. Syftet med studien var att få en uppfattning om hur implementeringen av BNWAS har utvecklats praktiskt inom sjöfarten. För att undersöka detta har haverirapporter granskats innan samt efter implementeringen. Resultatet från detta har jämförts med tidigare implementeringar inom samma område. Data har sedan kvantitativt och kvalitativt analyserats. Resultaten tyder på att implementeringen av BNWAS har stött på samma problem som liknande implementeringar gjort tidigare. De slutsatser som dragits utifrån dessa resultat var att implementeringen av BNWAS kunde ha gjorts på ett bättre sätt om lärdomar från tidigare implementeringar tagits med i utvecklingen av implementeringen. Studien visade att grundstötningar har minskat i den undersökta haverikommissionens utredningar. / BNWAS was implemented in SOLAS, chapter V in 2009. Since that year, different types of ships have had different time schedules to install the system onboard. Navigational watch keepers have expressed both positive and negative attitudes towards the system and the operation of it. The purpose was to shed light upon how the implementetion of BNWAS has developed practically at the end users. The purpose of the study has been fulfilled through both qualitative and quantitative methods. Accident investigation reports both before and after the implementation were examined togheter with examinations and reviews of earlier studies regarding questions about implementation. This work was done to reach the goal of the study with a reliable result. These results implied that the implementation had encountered the same problems as earlier implementations (in the same area) had. They also showed that groundings of ships occured in the same way both before and after the implementation. The conclusions was that the implementation of BNWAS could have been developed more smoothly if the problems from earlier implementations had been accounted for. The groundings have however been reduced significantly since the implementation, whether it is due to the implementation or something else is still to be found out with a more comprehensive study.