Another +1 for the sea bands. Pretty simple idea; A small plastic bead sits on an acupressure point that controls nausea and dizziness. I was feeding the fish on my first open water dive and bought them right after for the rest of that certification and they worked great. I just got back from training and working in Bali for 7 months and was on a boat 5 days a week for 3 dives a day. The only times I got sick were my first day diving because I couldn't remember where I packed them and once when I accidentally left them in my locker. I've even added a pair to my save a dive kit for myself or others that may need them.