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    Re: Updating of Electronic Charts
    From: Roger M. Derby
    Date: 2000 May 22, 7:29 PM

    I don't know how (or if) the data gets to the charting organizations, but
    the United States Power Squadron regularly provides updates to the positions
    of navaids and survey markers.
    
    Roger
    
    ----- Original Message -----
    From  "Philip OUVRY" 
    To: 
    Sent: Monday, May 22, 2000 7:08 PM
    Subject: [NAV-L] Updating of Electronic Charts
    
    
    > There is a problem which has been bugging me for sometime now.   Paper
    charts
    > have been developed into raster electronic charts and will ultimately
    become
    > vector electronic charts.   With a vector chart there can be up to 40
    layers of
    > information.   The navigational information thereon can be presented and
    > interpreted in a multitude of ways.
    >
    > However close examination of paper charts often shows large areas marked,
    for
    > example,  or .   Essentially
    the
    > data on which the chart is based is often sketchy or non-existent.
    >
    > Most national hydrographic authorities have few resources available to
    conduct
    > surveys of non-essential areas.   In the United Kingdom the Royal
    Institute of
    > Navigation encouraged Yacht Clubs and local groups to conduct  
    > which were detailed surveys of local navigable creeks and anchorages for
    which
    > no accurate charts existed.   However their results were not accepted for
    > inclusion on nationally available charts.
    >
    > The same problem exists for sailing directions or pilots.
    >
    > With GPS and electronic charts the temptation will be to explore more
    small
    > estuaries and potential anchorages.   It makes sense that every time a new
    place
    > is explored by a conscientious navigator, his results should be entered in
    a
    > database from which, either on a national or local basis, an increasingly
    > accurate series of electronic charts can be produced.   These could be
    simply
    > downloaded onto a navigators onboard computer.   They could also be
    supported by
    > a  service.
    >
    > In the United Kingdom the Cruising Association produce a Handbook which is
    > continually updated by the 6000 members and regularly reprinted.   It
    would seem
    > to be a good idea for all yacht clubs, cruising associations and
    long-distance
    > navigators to gather navigational data which could be fed into a central
    > database from which more detailed and accurate electronic charts could be
    > produced.
    >
    > Has anybody any comments?
    >
    > Philip Ouvry
    >
    

       
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