electronic charts lrg
DESCRIPTION
TRANSCRIPT
Grunt Productions 2007
Electronic Chart Systems for Training
An introduction to the use of electronic navigation systems and UKHO electronic products
A brief by Lance Grindley
Grunt Productions 2007
Covering:
Types of electronic chart Brief description of display systems Advantages of electronic chart
systems
Grunt Productions 2007
ELECTRONIC CHART TYPES
Grunt Productions 2007
Raster Navigation Charts (RNC)
Produced by “scanning” the master components used in the production of the paper chart.
“Unintelligent” Data. Additional “header” data is supplied with
each chart, i.e. the Satellite position correction.
The UKHO product is known as Admiralty Raster Chart System (ARCS)
Grunt Productions 2007
RASTER NAVIGATION CHART
Grunt Productions 2007
Raster Considerations
Advantages Easily recognised
format Quick and inexpensive
to produce
Disadvantages Cannot manipulate the
display Screen may appear
cluttered Cannot interrogate
information Over zooming may lead
to dangerous assumptions
Over Zooming Warning
Grunt Productions 2007
Electronic Navigation Charts (ENC) also known as Vector Charts
Produced by giving digital values to every point on the chart
Conform to IHO standard S57 Enables computer to identify the object, portray it in
the required form, place it in the correct position and provide information about its attributes
Intelligent data that can be interrogated UKHO ENC product is known as ENC - PILOT
ADMIRALTY ELECTRONIC NAVIGATION CHART (ENC)
Grunt Productions 2007
Vector Considerations
Advantages Tailored display, which
permits layers of information to be displayed
Linked to much more information
Smart Data, as the user “zooms” in on a position, more detailed data can be displayed, i.e. more soundings
Disadvantages Slow and expensive to
produce What you see may not be
what you need
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RASTER CHART OF THE APPROACHES TO MILFORD HAVEN
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ENC LAYERS - BASE DISPLAY BASIC TOPOGRAPHY
ENC OF THE SAME AREA
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ENC LAYERS - STANDARD DISPLAY TOPOGRAPHY + NAV AIDS (i.e. Lights)
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ENC - DISPLAY ALL TOPOGRAPHY + NAV AIDS +
TEXT & SYMBOLOGY
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ENC @ SMALL SCALE
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ENC @ LARGER SCALE
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SAFE DEPTH SET TO 8M
LIMITING DANGER LINE CAN BE CHANGED
Grunt Productions 2007
SAFE DEPTH CHANGED TO 15M