SH5 with TWOS is very stable, I have not had a crash yet. you can auto nav, auto shoot, or real nav and manual target, if you wish the nav map can be blank, no subs, no targets , its up to you. VDR has done a great job of making it play nice together. read the faq and have at it. there is a workaround for the steam issue, which I had to use no problems with that either
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