electronic charts lrg

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