A CLOSED USER GROUP ALARM MANAGEMENT SYSTEM WITH A GLOBAL DISTRESS SEARCH AND RESCUE FALLBACK FACILITY

摘要

The invention refers to device and method for a rescue transceiver device, user unit (1), transmitting a digital, coded alarm and information signal, distress signal (4a). The invention is characterised in that the user unit (1) transmits the distress signal (4a) on a frequency outside one or several predetermined frequencies for the International Distress and Search and Rescue Systems. The digital distress signal is based on an identify code unique for the user unit (1) and a continuously updated position. The user unit also receives a digital signal, rescue signal (6), from at least one master control unit, MCU (2), which rescue signal (6) comprises information. The user unit communicates the information in the rescue signal (6) to a user of the user unit (1). The transmitting means (3) also transmits an International distress signal (4b) on one or several predetermined frequencies for the International Distress and Search and Rescue systems when at least one predetermined condition is fulfilled. The invention also refers to a rescue transceiver device for alarm, search and rescue units, being master control unit, MCU (2), comprising means (13) for receiving ditigal distress signals (4a), preferably transmitted from one or more user units (1).