The SOSpenders autos take quite a bit of water to inflate.
I've worn them both on the bow of raceboats getting submerged and in massive breaking seas in the cockpit all day long and never had them fire on their own in those conditions.
Out of curiosity the ones i wore to USVI last year (which we dealt with a full day of breaking seas INTO the boat) I tested this spring and fired fine after about 5 seconds actually submerged.
I'm not sure if I'd want the manual inflate in the rocks considering if you get thrown you may not be consious to pull the lanyard.
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