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    Re: A credible AIS track for the Costa Concordia
    From: Lu Abel
    Date: 2012 Jan 25, 09:15 -0800
    To elaborate a bit:   I'm not sure that all countries of the world require double bottoms in tankers, but after the Exxon Valdez disaster, the US quickly implemented a rule that requires all tankers entering US waters to be double-bottomed.   I'm not certain, but I suspect that the EU followed.   Given that these two economic giants required double-bottoms and they consume 80~90% of the worlds oil, tankers became double-bottomed.

    From: Dave Walden <waldendand@yahoo.com>
    To: NavList@fer3.com
    Sent: Wednesday, January 25, 2012 7:55 AM
    Subject: [NavList] Re: A credible AIS track for the Costa Concordia

    Actully, it was the rule makers who REQUIRED double hulls. No one volunteered.
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