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Note:
∆X, ∆Y: Offset value for WGS-84
• When ∆X and ∆Y are contained in the chart data, the geodetic system is converted automatically,
and the chart is displayed inclusive of these offset values. At this time, the chart position for the
primary geodetic system is displayed in blue on the display panel, and "Chart Shift To WGS-84" is
displayed in the screen message area.
In such a case, the geodetic system conversion function will be deactivated even if offset values
are set in the "Datum Transformation" panel and the [OK] is left-clicked, and the message "The
Datum is already WGS-84" will be displayed on the panel.
3 Basic Operation of ECDIS
Chart position for the WGS-84 system
Chart position for the local
geodetic system
3-84
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