Man overboard is one of the most common and dangerous accidents that can occur whentraveling on a boat. Available research on man overboard systems with cameras have focusedon man overboard taking place from larger ships, which involves a fall from a height.Recreational boat manufacturers often use cord-based kill switches that turns of the engineif the wearer falls overboard. The aim of this thesis is to create a man overboard warningsystem based on state-of-the-art object detection models that can detect man overboard situationthrough inputs from a camera. Awell performing warning system would allow boatmanufactures to comply with safety regulations and expand the kill-switch coverage to allpassengers on the boat. Furthermore, the aim is also to create two new datasets: one dedicatedto human detection and one with man overboard fall sequences. YOLOv5 achievedthe highest performance on a new human detection dataset, with an average precision of97%. A Mobilenet-SSD-v1 network based on weights from training on the PASCAL VOCdataset and additional training on the new man overboard dataset is used as the detectionmodel in final warning system. The man overboard warning system achieves an accuracyof 50% at best, with a precision of 58% and recall of 78%.

Sjöfartsverket är idag huvudansvarigt för all sjöräddning i Sverige där lotsbåten är ett av de fartyg som deltar. Det nuvarande systemet för bärgning anses dock ha vissa brister beträffande räddning av personer som i vattnet är medvetslösa eller svårt skadade. Syftet med studien var att efter en inledande kartläggning av olika system för bärgning av medvetslösa eller svårt skadade personer, undersöka vad besättningsmän från Sjöfartsverkets lotsbåtar anser om systemen samt svårigheterna vid bärgning. I intervjuerna framkom det att dagens system varken är byggt för övning eller för räddning av någon som är medvetslös eller svårt skadad. Resultatet visar även att rådande väderförhållanden samt tiden är avgörande faktorer för en lyckad räddning. Majoriteten av besättningsmännen anser att ett system placerat i aktern tillsammans med det nuvarande systemet är den kombination av system som skulle kunna göra räddningsarbetet ombord på lotsbåtarna både enklare och effektivare. / The Swedish Maritime Administration is today the authority with the main responsibility inSweden regarding search and rescue where the pilot boat is one of the vessels involved.However, the current system of salvage is considered to have some deficiencies regarding therescue of persons from the water whom are unconscious or severely injured. The purpose of this study was that after an initial survey of the different systems for rescuing unconscious or severely injured people, examine what crew members from the Swedish Maritime Administrations pilot boats thinks about the systems and the difficulties surrounding the salvage. The interviews revealed that today's current system is not built to be practiced with orfor the rescue of someone who is unconscious or badly injured. The investigation also shows that the prevailing weather conditions and time are crucial factors for a successful rescue. The majority of the crewmembers consider that a system located in the stern with today's existing system is the combination of systems that could make the rescue work aboard the pilot boats easier and more efficient.