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    Re: GPS jamming concerns
    From: David C
    Date: 2016 Aug 9, 19:35 -0700

    Even with paper charts it is still possible in 2011 to completely wreck a 37,000 gross ton container ship. Go to

    http://www.taic.org.nz/ReportsandSafetyRecs/MarineReports/tabid/87/language/en-US/Default.aspx

    and scroll down to

    11-204 Marine Inquiry 11-204: Container ship MV Rena grounding on Astrolabe Reef, 5 October 2011
    Two relevant quotes are:
    .......and the master’s standing orders stated that “in coastal waters [the watchkeeper]
    should take fixes on a paper chart at frequent intervals of 10-15 minutes using more than one
    method”.
    "The largest-scale chart should be used wherever possible. A larger-scale chart was available
    (Chart NZ5413: Approaches to Tauranga) for the area covering the approach to Tauranga.
    This chart was not on board the Rena and it was not listed on the passage plan form."
       
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