MakoMike - thanks for that. Its a priveledge to see something rare. I had no idea it was THAT rare! Like you said, its hard to mis-identify that shark. It gives me the creeps (I read too much...) Very glad to know they are very rare.
Sakroc - While underway, dive boats have the same rules of the road as you. As soon as they anchor, and have a dive flag up, you must stay away. ( so you dont dent your prop on someone's head.) If you are on the San Diego bouy first, you ***may*** find yourself in a situation where a much bigger commercial boat is very pissed off at you. (Kind of like he has the right of way, because he is the bully.) I don't think its the law. If you are in a spot first, legally I think its your spot. I wouldn't move for a private boat. But I couldn't stop them from diving either. The main thing is you cannot encroach on them, once they have a dive flag up, until they are done and underway. If they had sense, they would not encroach on you.
I just got used to diving with the shark fishermen because they are far enough away when we are anchored to a wreck and they drift away anyway. The sharks will follow the slick, they don't stay near the wreck. Obviously if a guy is chumming directly over the wreck, we will wait for him to drift a ways so we don't interfere. We also tend to dive wrecks people don't know about that are low lying and hard to find. More bugs. If a fisherman is anchored to our destination wreck, we will wait, or try another wreck. Its just courtesy. There are a ton off wrecks out there. But the charters won't show that courtesy always.