Use the Nulls that are parented to the boat to rotate the oars. Rough rowing pose included for Genesis 8. Parent G8 to boat after applying ;-)
I used the awesome WTP ocean shader (Will Timmins Procedural Shaders) on a plane primitive in the above render. Just rendered with and without and used photoshop to delete the inner boat water.
*Model updated 27 May 2022 to fix mesh sticking through the bottom... and nobody wants that to happen ;-)