Should divemaster's or divers doing drift diving in location's like Cozumel have a Nautilus Lifeline or a similar device?
I think this is the ultimate solution for you in cozumel, or any other drift dive environment.
SPORASUB BLUE WATER INFLATABLE FLOAT This is what I use, and this torpedo concept has been used by WKPP deep ocean divers on 289 foot deep drift tech dives in 5 mph currents, flawlessly for almost 2 decades. With this one, or most shown, you need to create a towing harness, so the torpedo will run straight on the suraface, and distribute the weight from your line pulling on it.... I used an old dive flag staff( thin but strong fiberglass rod ) and have it running the full length under the float, and the line I pull connects to the bottom of this and rod about 1/3 of the way back from the front. If you don't configure like this, the float can nose dive from being tied to the very front end of the float--fine if it is being used to slow down a speared fish, but not good for scuba divers
You actually feel almost no pull at all with this float, very unlike any float used by any charter boats. I have a easy to use reel, to let the line out, and before jumping in, you let out about 20 to 50 feet of line, while the boat is still going at it's setting up speed of around 7 mph or so.....Related to this low drag issue, try having the boat go 16 to 25 mph, and dropping a standard dive flag or dive ball in the water at this speed, and see if the line is not ripped out of your hands, or you end up getting pulled in--with the torpedo, even at 20mph the pull is insignificant, and can't even be compared to the drag of normal dive flags....
The point being, this is comfortable and easy to tow around...you let out the minimum line possible, to avoid tangling yourself--you want the line as close to vertical as you csn get, without it pulling you up, messing with your buoyancy.
It needs little scope, as it has such small drag.
Deflate for flying, inflate before diving. Sell it at a profit to the mexicans on your leaving
In relation to the OP question, if this is not apparent - if i have been too obtuse..... The boat will see where you are, where you are headed, easily, even at huge distances and in enormous seas much bigger than a cozumel operator will take you out in..... Another bonus is that on the surface, you have an awesome buoyancy and zero drag swimming device