Special care must be taken when boating in waters where there are divers. All pleasure craft operators should be sure that they know what a “diver down” flag looks like.
If a vessel is engaged in a diving operation, it must indicate that it has a diver down by displaying the blue and white International Code Flag “A”, which means “I have a diver down: keep well clear and proceed at slow speed”.
Keep in mind that it is easy for divers to stray from the area marked by a diving buoy. When you see a diving flag, give divers plenty of room by keeping your boat at least 100m (328′) from the flag. If you cannot stay that far away because of the size of the waterway, slow down as much as possible, move ahead with caution, and keep clear of the vessel and diving site.