And if you're separated from your pack when you hit trouble? The only time I have used a PLB (as in actually set it off because we needed help) my wife was crossing a river (only knee deep but swift) with an already injured leg and she lost her footing and ended up face down in the water rapidly being taken away by the current, she couldn't stand up and I couldn't get to her so I yelled to her "just dump the bloody pack!" Which she did and then managed to scramble to the side of the river again, both of us were soaked wet and by the time we made it a couple hours further down stream where we had to cross to get back to the vehicle the river was now raging and hypothermia began to set in. We couldn't risk crossing the river and were getting in a bad way so I set off my PLB (it was actually a SPOT) and we were rescued.
If my PLB was in a pack and that sort of thing happened it would have been a very different outcome.
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