@jbgibson, wow, now that is a lot to take in. I'm to re-read the rich-in-info post slowly a few times to process the info, but yes, last night I watched a few educative videos about currents and it helped to understand the basics of them and how indeed I need to think about the winds first to do the surface currents. The deep ocean currents are a bit different and I'd love to try them out too if I could, but yes, first the winds, so I'll start doing some reading on that and check Pixie's tutorial and Geoff's Cookbook.