| 摘要 |
A radio activated danger warning system in the form of a radio activated bush fire warning system (10) comprising transmitting means (12) for transmitting a coded signal to a plurality of geographical zones (14), each zone (14) having a unique code assigned to it. The radio activated bush fire warning system (10) further comprises a plurality of receiving means (22) in the geographical zones (14) for receiving the coded signal and generating an alarm to warn of the approach of a fire. Each of the receiving means (22) advantageously includes a GPS receiver and a comparing means whereby, in use, it can obtain its current GPS coordinates and compare them with the GPS coordinates of the danger zone. In use, only those receiving means (22) located in the danger zone and receiving coded signals with the unique code assigned to that zone will generate an alarm.
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