You never know when you’re on a boat if you can prevent your things from getting wet. I always love to bring my DSLR with me, in case we run into sea life above the water. But I don’t want it to get ruined by dripping salt water on it. So I put everything I want to stay dry in a dry bag. Pro tip – if you are bringing sunscreen along, don’t put it in your bag with electronics. Or at least put it in a ziplock bag first. When heated, they can explode and ruin that camera gear you’re trying so hard to protect. I learned this the hard way.