No licenses here -- we are the wild west (wild south??)
---------- Post added August 6th, 2015 at 05:07 PM ----------
Few comments for clarification.
-At the time I didn't think it was necessary for anyone to leave the water, as long as the lines didn't cross, each group could've gone at their own rhythm.
-When I revved the engine was not in any way directed to the divers, there was a pretty big boat coming their way (at the time both free and scuba divers were kinda close). Very soon after that boat altered his course is when the divers surfaced, if they would've stay under few more minutes the currents would've separated us enough for each group to have plenty of space.
-I didn't attempt radio communications but I did have my radio on, at high volume on channel 16.
-The tone on my initial post was hard, and I am aggressive when I'm guarding divers regardless if they keep their air in a bottle or their lungs.
-I didn't post looking for agreement or criticism, I posted hoping to get a response from either the divers or the boaters. I wanted to fight someone at that point, but truly to tell the divers that at no time they were in danger from my boat, and ask the boaters what were they thinking? that taking divers out is not just dropping them in the water and then drift far away until they resurface, at least not in S. Florida and definitely not close to an inlet.
Fair enough. Here is how I used to handle this (back when I had a boat and freedove/scubadove (??) off of Miami.
In all cases, like you, BIG flag flown from my T-Top.
Freedive team had a flag float as well.
When freediving, I stayed very close to (right next to if I could) the team. Stayed in neutral when I could but always stayed real close. Too many idiots or uneducated boaters to take chances with people on the surface for a long time. W Freedivers were mobile and could easily coordinate with my boat position and keep clear if I had to nudge the gears. When one went down, I always went into neutral until they surfaced, but always kept it very close.
I was much looser with scuba divers, mainly because there was no guarantee they would surface right next to the flag. I did not want to be running around chasing close to the flag when I could not be sure when or exactly where they were coming up. So, I would stand off more (not 300 feet, but easily 100 feet at times depending on the current and area). The usual dive plan would be for all divers to stay with the flag carrier and surface near the flag--it being their responsibility not to get too far away. On my boat or with friends, we did not due multiple teams with their own flags, so I can't comment on how the pro dive boats handle things under those circumstances.
In all cases, if boats were approaching, I would position myself between the boat and the flag but not approach the boat any further. I would not run towards them at speed or anything like that, due to safety concerns for the divers below and also concerns about getting too far from the flag and then having to search for it. They would of course change direction, sometimes still passing too close, but I would not chase after them because I would only be contributing to the risk for the divers, having two boats in gear around the flag.
Unfortunately, I would have to assume that any boat near me did not know what a dive flag meant. Over time, I learned that most did, but there were enough exceptions so that I always followed that assumption.
However, S. Florida is crowded with many users, doing many different legitimate things, often at speed, perfectly lawfully. That is why I did not rely on the surface float/flag as they can be hard to see, and would keep my boat and its BIG flag as close as prudent for whichever divers I was carrying.
I might also add that idiocy is not limited to boaters. One time in my life, I came within a hair's breadth of hitting divers who surfaced right under my boat, while I was at speed, and who had no flag, no float, and who had not deployed any SMB. Their boat was a speck in the distance and even if it had a flag they were way, way from it (more than 300 feet and maybe twice that) so that it was not visible.