Join Date: Sep 2010
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On my subtropical island just north of Okinawa all the dive shops' staff anchor and dive, meaning no one is aboard/above water during the dive.
This is because they are usually sole owner/operator type businesses that can't afford a dedicated captain, so they do double duty - captain and dive guide.
They set the anchor, then descend the anchor line to verify the set is suitable. If required, they make adjustments, such as taking some slack to wrap around another secure spot.
When I descend, I always check the set myself, too. I want to satisfy myself that the boat will be there when we come back. [I work part-time as a dive instructor for fun]
But this is _never_ done with tension on the rode, engine running, etc.
Permanent moorings that protect coral are, of course, ideal, but not always practical, permitted or affordable.
I've also towed a boat to port pulling the anchor rode by swimming fin power only when the engine blew, which is not practical, preferred (if even permitted) but IS affordable! Good exercise, too!