I have been diving in all kinds of environments since '82 but my girlfriend is a new diver with 10-12 open water dives. We are thinking about the Cayman Agressor in May. Are the currents strong at that time of year? Are they OK for a new diver?
You're OK for current.
The Aggressor typically spends 90% of its week over on Little Cayman, which generally has very little current to be concerned about. When there is a current, its typically of the mild type where the rule is:
"start your dive swimming into the current; drift back".
What's probably a bit more of a concern is buoyancy control, as the wall drop-offs are generally quite steep, going into La-La Land.
As such, for a <20 lifetime diver, I'd recommend starting out fairly conservative on max depths off the wall, to keep it to be less than 200fsw or thereabouts.
:dropmouth:
Okay...seroiusly, the max depth policy is typically 100-110fsw and I'd shoot for 75-80fsw max with a Novice, until such time that their buoyancy, SAC rates and Narcosis susceptibility risks are all adequately sorted out.
There are a few walls on Little Cayman where the dropoff literally undercuts, so if you drop a weight (or have buoyancy problems that crash you to the bottom), the first 'bottom' to be touched is supposedly at around 300fsw (I've not gone down to look).
Here's an example of the wall's slope off of Great Wall West; IIRC, at around 110fsw:
In many areas, I've found that there's a ledge at around 130-140fsw, or that the wall's slope breaks off (to "only" a 45 degree angle), and both of these are often visible below you (when you know what you're looking for), due to the typical 75-125ft visibility.
-hh