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EPIRB and Personal Locating Beacons (PLB) - What you what to know...

Firstly have a look at beacons.amsa.gov.au as it's here where all the official answers are as to how they work, where they work and what to do when one is activated.

Most importantly is to buy one with the GPS built into it. The unit will transmit your lat/long and your location can be narrowed down to 120 metres.