Re: do you carry an acoustic Guitar?
I'd suggest that if you're very concerned about those types of things that you get yourself a less expensive guitar for the boat.
I've never noticed an issue, though we have only kept the guitar on board during the summer months. But I'm not a virtuoso and don't have expensive guitars...
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)