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    Re: Varuna -- Abandoned due to Loss of Power
    From: Bruce Cutting
    Date: 2017 Sep 11, 11:54 -0600

    Seaclear II and OpenCPN - both FREE - applications display NOAA ENC charts
    (They also display RNC charts)
    > <<  there are now inexpensive apps available for iPads and their non-Apple
    > equivalents that can display actual ENC charts. >>
    > Nobody can display ENC charts, because ENC is an archive format based on
    > ISO 8211 and S-57.  In all cases, the ENCs need to be converted to SENCs
    > (System Electronic Nautical Chart) to be displayed.  So every ENC
    > Stakeholder has their own SENC format which is proprietary and closely
    > guarded.  Some systems convert the ENC to SENC on the fly and store the
    > SENC internally.  Other systems have tools to pre-convert the ENCs to
    > SENCs, and others convert it and put the SENC on a cartridge.  So from ECS
    > to ECDIS systems, there isn't much difference in the process, but the
    > results may be dramatically different.
    > <<  Do not confuse recreational boat chartplotters and their charts with
    > government issued ENC charts.  >>
    > The warning letter I received from IHO was regarding inconsistencies of
    > the government issued ENCs, from various different national HO agencies. 
    > So we have acknowledged discrepancies of the government base data, then it
    > is converted by the display device according to its own interpretation,
    > and we end up with a 2 tier game of Password.  Be careful folks.
    > For those who are looking for the most reliable chart data, worldwide, the
    > best way to get it is to go to the NGA website and download the Notices to
    > Mariners and Light Lists for your area, and plot them on your chart.  
    > Regards,
    > Pete 
    > View and reply to this message:
    > http://fer3.com/arc/m2.aspx/Varuna-Abandoned-due-Loss-Power-Palmer-sep-2017-g40013

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