Thx to all who,ve replied ,I have mods but they have not yet been activated ,the batteries charge up to 100% ,no crew at General quarters ,this 0 knots happens at 128,256,512,TC, I can get headway with 64 TC ,also the problem does NOT occur when submerged . The weather topside is Clear sky ,high wind and a heavy sea running , it must be the weather ! Also while I,m on the subject,the crew on lookout are not dressed for Foul weather ,my Lads are gettin soaked t th skin ! Is there a mod for S,westers etc ? Its a Great game ! H