Personal Locator Beacons are battery-operated devices that are carried and used in order to transmit a personalized emergency and/or distress signal.

Out of these that are portable are typically are GPS-based devices, and the ones which are fixed may work on GPS or Doppler mantra. A Personal Locator Beacon should be activated only in situations of grave and imminent danger, and only as a last resort when all means of self-rescue have been exhausted.

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