Thanks , works like a charm! Actually, I like that you made it into a node because it reminds me how big some of my functions are when they pop me with a loop limit fault at high map sizes. 
baby took 1 minute 49 seconds to generate. At least 50 million iterations. 120x60 (7200 tiles, or 1/3 the size of a gigantic map)
When I start carving continents and other landmasses into those waters the iteration count should drop, but I have plenty of things coming that will raise it back up again.