When drift diving you do not shoot a bag. (but the experience will be helpful)
What you do is unwind a tether as you descend. When you level-off at 5 feet above the bottom, you drag the surface float-n-flag behind you. When you ascend, you slowly wind in the tether.
Once you get the hang of it, drift diving is an excellent form of diving in my opinion. It eliminates the anchored boat and the need to descend an ascend an anchor line.
If you go in a group, the leader of the group will handle the flag. You will be required to stay with the leader.
If you dive in teams of 2, then you may be elected to handle the flag.
In theory, but not always in practice. Every charter I've been on North of Boynton , somebody shoots DSMB.
Some ops do like people to stay with the DM and the float, but not all. Not a great idea when people are hunting.
Even the ops that like you to stay with the DM, are not going to thumb everybody's dive when one person needs to surface because of lack of gas or RBT. You will spend about 7 minutes making your accent, drifting further and further from the surface marker. (I or a buddy normally send our DSMB's as soon as we are ready to come off the bottom.) Even if I am able to stay with the DM, somebody else has sent a marker for himself.
The Scuba Club is one of those ops who require you to stay with the DM (particularly if they don't know you.) Even then, they have several guides in the water who often spend the dive shooting their own DSMB's and escorting small groups to the surface.
Boynton and South they have different protocols. They will break up the group into small parties and give each a float. It is up to you to make your plans with the others.
I have some stills of my sausage relative to the boat, but I cant't seem to upload them. I'll bore you once more with this video. It is not as scary as it looks, because I deployed the marker while relatively close to the guy with the surface float which allows the boat crew to mark my position a full 6 or 7 minutes ahead of my surfacing.
JDC032.flv video by mm2002_bucket - Photobucket
And Eric, I know for a fact that Jupiter Dive Center, Scuba Works and the Scuba Club all rent steel tanks.