AwCall is an integrated system that automatically detects man-overboard and immersion incidents and sends the casualty’s location onboard and ashore. It comprises RF and LTE wearable MOB units, an onboard receiver, a monitoring server, and a control platform. Conventional marine safety devices may rely on water-contact sensors that react to rain or waves. Dependence on smartphones or a single network can also delay distress reporting in coverage gaps. AwCall fuses nine-axis IMU and pressure-sensor data through on-device AI, analyzing fall motion and immersion conditions to distinguish actual incidents from water contact alone. Users select an RF or LTE MOB unit based on operating distance from shore and conditions. When detected, location and event data are delivered to onboard crew and the shore monitoring system, which automatically alerts the Coast Guard or rescue authorities. This layered architecture accelerates response initiation for solo fishers, older fishers, small-vessel crews, and recreational boaters.