8. CHART ALERTS
8-2
8.1 Chart Alerts
Official S57 chart material contains depth contours that can be used for calculation of
chart alerts. A chart database also includes different types of objects that the operator
can use for chart alerts. The procedure for setting chart alerts is outlined below.
1. Choose suitable safety contour for your own ship. See section 8.1.1 for how to set
the safety contour.
2. In the Voyage planning mode, define a new route or choose an existing one. Make
a chart alert calculation of the route if there are indications of danger areas in the
route. Modify your route if necessary and do the chart alert calculation again. To
modify an existing route see section 9.5.
3. Choose route as monitored route.
4. Set a “look-ahead” for your own ship, referring to section 8.2.
The system is now ready for chart alert calculation of monitored route and estimated
own ship position.
8.1.1 How to set safety contour
Select safety contour suitable for the own ship.
1. Click the [DISP], [SET] and [Chart Alert] buttons on the InstantAccess bar
™
to
show the [Chart Alert] page.
2. Enter desired depth at [Safety Contour] then click the [Save] button.
A depth contour is created on the chart according to the safety contour value entered.
Note: If the chart does not contain chosen depth contour, the system will automatically
choose next deeper contour.
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