A Jon Line is an absolute must for divers decompressing in high current areas but who don't have the option of doing a drifting deco. A Jon Line is attached to the diver and then clipped to a shot line so the diver needn't spend any energy holding onto the shot/anchor line themselves. Plus a Jon line enables more divers to be at same depth on the shot/anchor line without crowding each other.
There's no point in trying to go against the flow. A reef hook lets you attach yourself to a reef or other structure in a current and stay in the same place without exertion. It leaves your hands free for underwater photography and videos.
We have some great Jon lines and reef hooks for scuba diving available from The Scuba Doctor dive shop.