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    Re: sextant without paper charts
    From: Scott Owen
    Date: 2008 Oct 29, 23:38 -0500

    frankreed{at}HistoricalAtlas.net wrote:
    > Scott wrote:
    > "As to HO229, there is no paper copy requirement IF
    > the ship is authorized for usage of DNC charts.  Not all ships and
    > submarines are authorized for DNC usage yet.  In any event, the prudent
    > Commanding Officer would probably carry a paper copy of HO229 and any
    > Harbor chart that the ship is expected to call on during next expected
    > voyage."
    >
    > I don't see the connection between carrying HO229 and DNC (digital nautical
    > chart).
    >
    >  -FER
    Frank,
    Not sure there IS a connection, but there are certain hardware and
    publication requirements in order for a ship to pass a navigation
    certification.  The publication requirement depends on whether or not
    the ship/submarine is authorized to use DNC for primary navigation.  I
    suspect this has to do with the computer/IT systems and integration of
    the GPS system installed in the ship.  As I understand it, if the
    ship/submarine is authorized to use DNC for primary navigation purposes,
    then all publications provided by NGA [including HO229] can also be
    carried in "electronic" pdf format with the exception of the Nautical
    Almanac [I know it comes from USNO] which still has to be carried in
    paper form.  If the ship is NOT authorized for DNC usage then there is a
    paper requirement for ALL charts and publications.  True you can do
    sight reductions with just the NA but all the USN ships I was ever on
    [granted a few years gone by] all carried a paper copy of HO229 and
    calculators so the QMs could take there pick when doing celestial
    navigation.
    
    --Scott
    
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