This document introduces electronic chart systems, describing raster navigation charts (RNCs), electronic navigation charts (ENCs), and their advantages and disadvantages. RNCs are produced by scanning paper charts, while ENCs assign digital values to chart points, enabling interrogation of intelligent data. ENCs allow customized displays by layer, showing more detail like soundings when zoomed in, while RNCs cannot be manipulated and may appear cluttered when over-zoomed. Overall, the document provides an overview of electronic chart types and considerations for training purposes.

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Electronic Chart Systems for
Training
An introduction to the use of electronic
navigation systems and UKHO electronic
products
A brief by Lance Grindley

2. Grunt Productions 2007
Covering:
 Types of electronic chart
 Brief description of display systems
 Advantages of electronic chart
systems

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ELECTRONIC CHART
TYPES

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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)

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RASTER NAVIGATION CHART

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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

8. Over Zooming
Warning

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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

10. ADMIRALTY ELECTRONIC
NAVIGATION CHART (ENC)

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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

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SAFE DEPTH
CHANGED TO 15M