IIRC, the major difference was in the type of galvanization done to the chain and the thickness and quality of the zinc layer on the chain. Regular "home depot" chain isn't designed to be immersed in salt water and used in a salt water environment for extended periods of time and the galvanization is generally lighter and less durable than that of "marine" chain.
Also, in some cases, the link size is different... so what you get at the building supply store may not fit the windlass
gypsy, which can be very dangerous if it is a close fit, but not perfect, since it may come off the windlass
gypsy when it is heavily loaded.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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