Thanks fellas. I installed (outside program files) SH3 today, tested it, all good. Then installed GWX, tested it, all good. I noted in a single mission, the ships on the horizon were not as clear as they are in SH4. At a great distance, almost appeared as if they were above the water line. Don't know if that's normal.
I wonder if I need this: Silent Hunter Resolution Fix 1.4b
Will tackle SH Commander tomorrow. Thanks for the advice and the link.