The standard model sinks. I haven't tested mine but the specifications say:
Quote:
Waterproof: 16.40 ft (5 m) @ 1 hr., 33 ft (10 m) @ 10 min. Factory tested @ 70°F, exceeds RTCM waterproof requirements

A non-waterproof PLB would be rather useless imo. I didn't need the version that floats because my ResQLink is tethered to the outside of my survival/flotation vest in a pocket high on the chest.
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Better is the Enemy of Good Enough.
Okay, what’s your point??