1-19
1.3.3 Chart cards, charts
Before turning on the power set a chart card of your area in the card slot. Turn on the power, and
the card data is automatically read and shown on the display. If you set a chart card in the card
slot after turning on the power, operate
,
to display the chart.
Leave the chart card in the slot while the plotter is in use. This enables redrawing of the chart
when chart scale is changed or display is shifted.
The chart card can generally be classified in two types: general and detailed. For example, a
general card might shows the shoreline of California, and a detailed one might show San
Francisco Bay.
Note:
Chart cards are intended for reference purposes only. The navigator always confirms his
position against other aids to navigation.
a
b
C
A
B
D
The sample chart above shows the Ise and Tokai districts of Japan. On the chart there are four
areas circumscribed and labeled A, B, C and D. These rectangles are called indices, and they
show locations on the chart which can/cannot be enlarged without losing detail. For example,
chart detail for a point within A, B, and C, for example, point "a", would be reduced. For a location
outside of D, for example, point "b", detail would be greater than point "a".
Note:
Chart indices can be erased or displayed as desired.
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