Remember too that if you're anticipating use over/in water, that you'll want one of the floating models. Either the current ResQFix (which I think is just a MicrOFix with the float pouch) or the newly announced ResQFix12 or AquaFix.
My MicrOFix is clearly labeled on the back that it will NOT float by itself. Which is fine for my usage, but not appropriate for marine use.
FWIW, I DO NOT consider a buoyant PLB a requirement for overwater or marine use. Even if it floats, it still needs to be tethered to you to prevent loss, so buoyancy gains you little, really. Moreover, in the case of the ResQFix, it means you can no longer operate the beacon one-handed. You have to partially remove the "float coat" in order to deploy the antenna. It's really a bit of half-baked design.
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