is a portable positioning and alarm terminal for personnel falling into water that is specially developed for personnel working on ships, lakes, and inland rivers, and is applied to intelligent life jackets or lifeboats. This device is based on the new generation of AIS+DSC VDL (VHF Data Link) universal maritime communication and Internet of Things protocol. It has the characteristics of miniaturization, low power consumption, fast response, high positioning, and long working time, and meets the latest IMO MOB standard specifications (IEC 63269 Ed.1). It is very suitable for typical applications such as life jacket intelligent positioning communication devices that require miniaturization and ultra-long working hours.