Has anyone ever thought about using accoustic doppler
current profilers to actually know what the current is
on the bottom?  They make them that will give a
profile down to at least 150m.  Not exactly cheap
(probably around $25K), but in dicey current areas,
they could provide a lot of info about the situation
on the bottom.  

mike
> 
> Q) How do you manage current?
> A) Often times we dive sites that have slack on the
> surface and are ripping below 200'.  We head down
> the
> line and if we run into these conditions, we call
> the
> dive.  It's over, no questions asked.  If the
> current
> picks up while diving, we shorten the dive and/or do
> a
> drift deco.  However, the single biggest tool we
> have in
> our fight against current is the scooter.  No
> scooter,
> no diving in a situation that might encounter heavy
> current.  When our safety divers clean us during
> deco,
> they keep a scooter for getting back and forth to
> the
> boat.
> 
> Summary:  If the scooter goes forward, we dive.  If
> the
> scooter goes backward, we have no business being in
> the
> water and try it again some other day.
> 
> 

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