hey frank,
the one the red herrring gave ya is bout the best one that's free.
the main subscription service is this one
http://www.seasurface.com/
its pretty neat. and u can check out old data to get a feel for how the whole thing works.
it is pricey, but i think if ur part of a club its cheaper.
nonetheless, it'll save u a heap of time trolling around for the right spot to cube, and thats always a bonus