Rule 235 of sailboat safety: Never, ever sail without a knife. Rule 235b: Make it a Spyderco.  The Spyderco Atlantic Salt ($110) is as good as it gets and remarkably beautiful too! It’s sheepfoot shaped blade is forged from precipitation hardened, nitrogen infused H1 steel with a fiberglass reinforced nylon handle.  H1 steel contains .1% nitrogen, instead of the typical high-carbon steels of other knives, rendering it impervious to ionized chlorine in salt water. But if geeky chemistry isn’t your thing, maybe you will appreciate the rounded sheepfoot-shaped blade, made popular by the seafaring captains of old as a check against their crew going postal.