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    Chart/pub corrections.
    From: Jeremy C
    Date: 2010 Dec 1, 05:14 EST
    Greg wrote:

    How do you organize a set of trip charts (paper) for bridge use or is everything done in a seprate chart room? Do you have them in numerical sequence and folded/ unfolded. Do you ink the chart number on the back of the chart by the margin? What is the chart correction process these days?

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    I could write a long essay on chart correction procedures these days.  They have changed dramatically in the last few years.
     
    First the easy ones:
     
    For a give voyage, the chart catalog is consulted to get the chart numbers of various scales which will be needed.  Those charts are then pulled out of storage and placed in the correct order of usage (using a binder clip to keep them together).  They are then usually corrected and the waypoints and course lines then plotted. 
     
    Our bridge has a limited set of drawers that contain the charts that are routinely corrected which include the local area as well as charts to the places we are most likely to go.  The remainder are stored in a closet.  Since we are on the naval distribution list, we have a nearly complete catalog of charts.  We are missing some of the odd harbor and river charts, but basically we cover most of the navigatable waters of the world.
     
    As new charts come in, they are indeed folded so the blank side is out and numbered in the corner along with the edition number so that we can quickly determine if a new chart is a new edition.
     
    Updating the ECDIS is simple.  We are sent CD-ROM's with update patches.  They can then be uploaded to the computer and the charts in that area are corrected automatically. 
     
    I spent most of my time as navigator in 2001 and 2002.  At that time we used the more familiar old system of getting weekly notice to mariners in paper booklets.  You then found the applicable corrections for both the charts you are using and the navigational publications.  You then kept the booklets filed in case you had to correct an unexpected chart.  You kept the booklets on file until the summary of corrections came out.
     
    That was then, this is now.  NtM are no longer published in paper form.  You now get them emailed automatically (or through a service the screens the entire file for applicable entries and only send you the needed entries) or download them off of the web.  They have also divided the NtM into corrections for paper products and another website for purely digital publication corrections.  They only publish a few of the publications in paper now, many of them, such as sailing directions, are only available as pdf's and are corrected in an entirely different process.
     
    Once you download the NtM you either use the pdf on a screen to make corrections, or you print out the needed pages and do it that way.  I prefer the latter as I can put the paper on the chart and reference it easily.
     
    The electronic pubs have something called PDU's.  They are essentially patches that you apply to the pdf file of the publication and it automatically corrects the publication.  If you want a hard copy, you have to manually print it in whole or part.  For voyage planning, we typically print out the applicable sections we need.
     
    Getting these updates can be expensive over satellite connections, if possible at all.  My company also sends out CD's periodically on which they burn the NtM.  That is delayed many weeks, so we typically download them on the ship when we are around somewhere with an Internet connection.
     
    Summary of corrections are also available via download and CD-ROM. 
     
    That's it in nut shell.  Electronic pubs and charts are obviously much easier to correct, especially the vector based charts.  It also saves a lot of time for the typically over-worked 2nd mate.
     
    Jeremy
     
    In a message dated 11/25/2010 11:53:25 P.M. Central Asia Standard Ti, gregrudzinski@yahoo.com writes:

    Jeremy,

    Greg Rudzinski
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