Personal alarm system for forestry workers etc. uses mobile telephone as radio transmitter for alerting control centre

摘要

The system includes a radio transmitter, and an automatic alarm circuit that triggers an alarm signal at a control centre in accordance with preset parameters such as time elapsed or inclination angle. The radio transmitter is a mobile telephone (2). A holder (3) for the mobile telephone is worn about the person. The holder includes the alarm circuit and contacts for connecting the mobile telephone. A GPS module may be included. An Independent claim is included for a method of triggering a personal alarm system.