Thanks Arclight, now the game looks great!!!

And i didn't have to spend more than a minute for optimizing. The skyline still gives a feeling time to time that there is "large pixels" in the smoothly changing colors, but water, interriors and sub's are great. My black Porpoise has newer been so pretty during sunset
Here are my settings for 7950 GT:
Anisotropic Filtering = 16
Antialiasing - Gamma Correction = Off
Antialiasing - Setting = 4x
Antialiasing - Transparency = Multisampling
Conformant Texture Clamp = use hardware
Extension Limit = Off
Force Mipmaps = None
Maximum prerendered Frames = 5
Multi-Display/mixed-GPU acceleration = single display performance mode
Texture filtering - Anisotropic sample optimization = Off (can't change at all)
Texture filtering - Negative LOD bias = clamp
Texture filtering = High Quality
Texture Filtering - Trilinear Optimization = Off
Triple Buffering = Off
Vertical Sync = Application
I get round 30 - 40 fps while inside the boat and 40 - 50 at deck/outside the ship. Map gives 60.