Person overboard detection Drone Guide

Person overboard detection is an important maritime drone application because locating someone in the water can become extremely difficult within a very short period of time. Waves, darkness, weather, sea state, vessel movement and the relatively small visible profile of a person can all reduce the chance of detection from deck level. Drones can add a fast aerial search layer around ships, ferries, offshore platforms, ports and coastal operations. Equipped with high-resolution RGB cameras, thermal sensors, AI person detection and powerful zoom, a drone can quickly search the surrounding water, identify possible targets and provide live coordinates to the rescue team. The strongest use of drones is not to replace established man-overboard procedures, lifeboats, coastguard support or vessel manoeuvres. Instead, the drone provides additional situational awareness from above. It can search areas that are difficult to observe from the ship, maintain visual contact with a detected person and help rescue teams navigate towards the correct location. For larger vessels and offshore operators, future systems could use permanently deployed drones that launch automatically following a confirmed man-overboard alarm. Combined with AI and vessel navigation data, this could reduce the time between the initial alert and aerial search. ## **What Is Person Overboard Drone Detection?** Person overboard drone detection uses unmanned aircraft to search for, identify and track a person believed to have entered the water from a vessel, offshore platform or coastal location. The drone may be launched manually by trained crew or, in more advanced systems, from an automated docking station. Once airborne, it searches the surrounding sea using visual and thermal cameras while transmitting live video to the vessel or rescue team. AI can assist by identifying human-shaped objects in the imagery and highlighting potential detections for immediate human review. ## **Why Person Overboard Incidents Are Difficult** A person in the sea presents a very small target compared with the size of the surrounding search area. Only the head, shoulders or part of a flotation device may remain visible above the water. The vessel may also continue moving for some distance before the incident is confirmed. Wind, current and waves begin moving the person away from the original position immediately. Every minute therefore matters. The faster rescuers can establish the person’s approximate location, the more focused the search can become. ## **Why Use a Drone?** A drone provides a higher viewing angle than personnel standing on the vessel. From above, it can search a much wider area and look behind waves or around parts of the vessel that may obstruct the crew’s view. The aircraft can also move independently from the ship. While the vessel turns or prepares rescue equipment, the drone can remain near the suspected location. This separation between search and rescue functions is extremely valuable. The drone searches and maintains situational awareness while the vessel or rescue craft concentrates on recovery. ## **Rapid Launch** Speed is one of the most important factors in a man-overboard response. A drone should ideally be stored in a location where it can be launched quickly. A complicated setup process reduces much of the operational benefit. For vessels that regularly operate in high-risk environments, dedicated ready-to-fly systems can be more valuable than a general-purpose drone stored deep inside the ship. ## **Automatic Launch** Future maritime drone systems may launch automatically when the vessel’s man-overboard alarm is activated. The drone could receive the vessel’s position, heading and the estimated location where the person entered the water. It would then fly directly towards the initial search area while crew members begin established rescue procedures. Human supervision should remain part of the operational framework, but automation can reduce response time. ## **Initial Search Position** The first search location is normally based on the estimated point where the person entered the water. The drone can receive this position from the bridge or from integrated vessel systems. If the person was detected by a camera, wearable beacon or man-overboard sensor, that information can improve the initial search area. Accurate timing is important because current and wind begin moving the person immediately. ## **Search Patterns** Once the drone reaches the area, it can follow a structured search pattern rather than flying randomly. The exact pattern depends on the accuracy of the initial location, sea state and surrounding conditions. Autonomous mission planning can help ensure that the area is covered systematically. The drone should remain flexible enough for the operator to redirect it immediately when a possible target is identified. ## **Expanding Search** If the person is not found near the initial location, the search area can expand progressively. The drone can cover rings or other defined patterns around the estimated position. Current and wind information can also shift the search area in the expected drift direction. This allows the search to become more intelligent than simply expanding equally in every direction. ## **AI Person Detection** AI person detection can analyse live drone imagery and identify shapes that may represent a human. When the system finds a possible target, it can place a marker or bounding box around the object and alert the operator. This can reduce the chance that a small person is overlooked within a large image. Human confirmation remains essential because waves, debris and flotation equipment can create false detections. ## **AI Person Detection Over Water** Detecting people over water is more difficult than detecting them on land. Waves create constantly changing patterns, reflections can appear and disappear, and only a small portion of the person may be visible. AI models therefore need training specifically for maritime conditions rather than relying only on general person-detection datasets. Performance also depends strongly on altitude, camera resolution, sea state and the clothing or flotation equipment worn by the person. ## **Thermal Imaging** Thermal cameras can provide an additional search capability, particularly in low light or darkness. A human body may create a thermal contrast with the surrounding water, but the effectiveness varies significantly with water temperature, clothing, immersion time and environmental conditions. Thermal imaging should therefore complement RGB cameras rather than be treated as a guaranteed detection method. ## **Thermal Detection at Night** At night, thermal imaging can become particularly valuable because normal cameras may struggle to identify a person without artificial lighting. The drone can scan the water for thermal differences and then use the RGB camera or searchlight to confirm the target. The strength of the thermal signature may decrease as the person’s exposed body area reduces or cools. This makes rapid deployment important. ## **RGB Cameras** High-resolution RGB cameras remain essential because they provide the detailed visual information needed to confirm a person overboard. Colour imagery can identify lifejackets, clothing and rescue equipment. In daylight and good visibility, RGB may provide stronger identification than thermal imaging. A professional maritime search drone should ideally provide both. ## **Optical Zoom** Optical zoom allows the operator to examine a suspected target without immediately flying directly above it. This can reduce unnecessary aircraft movement and help confirm whether an object is a person, buoy or floating debris. High zoom requires excellent gimbal stabilization because even small aircraft movements become highly visible. ## **Wide-Angle Search Cameras** A wide-angle camera is useful during the initial search because it covers a larger portion of the water. On