Why are people objecting to a 70mm x 130mm canister? That's 2..75"x5.1". No big deal. And the $124 cost will be a lot less than redesigning the ACR 2881 to be good for depth.
Otherwise, even if you carry a fancy two-way radio on dives, get the PLB for your car, then out for hikes.
Seems silly that Nautilus can be dived without a canister, the technology exists and would be even easier to implement with a PLB if it can be done with the Nautilus since the Nautilus design is at least 3X as complex. I like to travel light and dive light.
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