JD EE,
sadly there are no water column measurements available for that area to determine if not exact, at least general deep currents for the time being. There is some stuff on mesoscale eddies, but it's mostly surface or down to 10m. The ITCZ over the area at the time would have some effect on micro-eddies down to 200m.
Also, debris could have trapped air or be neutrally buoyant at various depths, depending on how it sunk and what parts they were (i.e. galley would probably sink faster than outer shell) so that would effect its sink rate significantly.
There is software available for oceanographers and NOAA but i'm afraid that they simply don't have enough data for that area to make the result viable (can anyone confirm this?!??)
