>>522341I think they're all waterproof... don't think i've seen one that isn't.
However, some float, others do not. If you're on water often, might consider one of the intrisically floaty ones.
Mine requires a floaty-pouch to float (got one (two, actually) anyways, it's how I strap it to my pack(s)).
The ResQLink Plus floats w/out the pouch, but it's also a touch bigger than my ResQLink.
I don't think saltwater will affect it, but it'd probably be worth hosing it off with clean water at the end of the day.
>Waterproof:>16.40 ft (5 m) @ 1 hr., 33 ft (10 m) @ 10 min. >Factory tested @ 70°F, exceeds RTCM waterproof requirementsDoesn't float, but did pass self-test.
