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Chapter 2: Getting Started & Adjusting the Display 2-21
Moving Around the
Chart
• The radar is redrawn to the scale and heading mode of the chart.
• The radar is set to True motion so that the radar and chart images remain
synchronised as the vessel moves.
Note: Depending on the topology of the coastline, the radar returns may not
relate to the charted shoreline, the radar image will therefore be different to
thechart display. For example, agentlysloping beach witha cliffseveralhun-
dred metres beyond the charted coastline, the cliff is not shown on the chart
but will be displayed on the radar image.
Changing the Chart Scale
The RANGE key allows you to change the chart scale so that you can see a
smaller or larger area on the screen.
Plotter mode is available to allow you to zoom into a smaller area, even when
nochart data is availablefor thatscale. Section 7.7describeshow toset plotter
mode on/off.
You can change the chart scale for two purposes:
• To see either more detail (of a smaller area) or a larger area (in less detail)
on the screen.
• To move the displayto another area of the chart,by zooming out toa small
scale chart, then zooming in on another position centered on the cursor.
The cartographic detail available on charts varies according to the chart scale
and some areas include detail at smaller scales than others. This can cause
blank areas on the display when adjacent areas with different levels of detail
are displayed. To reduce this affect you can use the Chart Set Up options (see
Section 7.7)toset chartdisplaydetailto simple.Then,as youzoomin, charted
areas are displayed but with less detail shown.
Each time you press the RANGE key, the chart scale changes to the next
available setting. The status bar indicates the distance from top to bottom of
the screen, in nautical miles.
Figure 2-10: Changing the Chart Scale
RANGE
D4175_1
Increases the
chart distance
Decreases the
chart distance
Vertical distance
displayed on chart
Status Bar
6nm
CSR 50 45'980N
POS 001 01'490W
81186_3.book Page 21 Thursday, August 22, 2002 8:23 AM