Going boating, regs or no regs every sane boater brings a good knife.
In fact I don't remember seeing knive in our regs, but it is a good
practice. Expecially if you have to cut others line out of the prop.

Maybe even 2 or 3. Me, I have one on my belt and another in the tackle
box as a minimum. Usually a couple more at the fish cleaning station.
Need to cut rope or a fish, or fishing line, only a quick reach away.

But keeping them shape. Same problem in the home. Real pain in the
crack. What experiences work best to get these things sharp enough to
shave with? Not gimick solutions, I mean get knives real professionally
sharp but do it at home or the cottage. What methods are people using?

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We all work for government, they ceased working for us a long time ago.