Dr. Noiswater is correct, however it is better to have more than one mode of protection. By the way, very interesting topic....I commend the locals for all of the regulations that have kept Grayton "small" or "smaller" than the monster tourist traps that are to the east and west. I, however, due to the long walk over to the water front, have prefered to leave my canopy up. Also, did you know that there were over 50,000 sea turtle nests in Florida two years ago. I don't know what species are near Grayton, but there seems to be a false sense of extinction.