Ferrante, I'd also recommend Enigma: Rising Tide as a good starter game. It isn't a hardcore ship sim, its meant to be a command sim; kind of a "gateway drug" to hardcore simulations like the Silent Hunter Series.
It's more action oriented, but all in all was received well by most players; Enigma sold over 300k units worldwide and, while its looking a little aged now in the graphics department, is worth trying out. I think there are still some downloads of the demos available out there somewhere.
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ENIGMA R.I.P.
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