These small speedboats bring snorkelers from the mainland, about 30 miles across the Andaman Sea. They all start about the same time in the morning, arrive at favorite spots about the same time, leave in time for lunch at the Park Headquarters, then go to another spot in the afternoon, and leave in time to get their customers back at their hotels for happy hour. We usually wait for these scheduled whirlwinds to pass, then enjoy the same good spots by ourselves.