Gulf Diving policy is to scrub in anything forecast over 4-6's. That means we stay home in 4-7's sometimes - read on. We feel that re-boarding the boat is dangerous in seas over 6 feet, and besides, it makes the crew cranky, and no one likes a cranky crew. We look at 4 different forecasts, including NOAA National Weather Service, the Navy, and two seperate forcasting agencies we pay for. We also call the NWS forecasters in League City for advice on close calls. The other consideration is wave period. If you have 4 foot seas in a 4 second period (square waves), the boat wiggles and shimmies and divers get dehydrated. Conversely, if you are in a swell (hurricane somewhere else in the Gulf) you may have 8 foot waves in a 15 second period that are perfectly safe and comfortable to dive in. Anyone wonder why I get ulcers at 9:30 on a trip day? Obviously, our number one priority is passenger safety. I don't need, want, nor deserve the reputation of diving is unsafe conditions.