11. Chart Alarms
11-2
11.2 Chart Alarms
Official S57 chart material contains depth contours which can be used for calculation of chart alarms. A chart
database also includes different types of objects which the operator can use for chart alarms. The procedure for
setting chart alarms is outlined below.
1. Choose suitable safety contour for your own ship. See paragraph 11.2.1 “Choosing safety contour“.
2. Check that “Chart Alarms” is set for display. See paragraph 11.2.3 “Highlighting chart alarm“. If you want
chart alarms to be included in some other objects or areas, choose them for indication or alarm. See paragraph
11.2.2 “Choosing objects in chart alarms”.
3. In the route planning mode, define a new route or choose an existing one. Make a chart alarm calculation of the
route if there are indications of danger areas in the route. For more information, see paragraph 11.5 “Route
Planning”. Modify your route if necessary and do the chart alarm calculation again.
4. Choose route as monitored route.
5. Set watch sector for your own ship.
The system is now ready for chart alarm calculation of monitored route and estimated own ship position.
11.2.1 Choosing safety contour
User has to choose safety depth suitable for the own ship. To choose suitable depth, do the following:
1. Spin the thumbwheel to display Chart Display/Info/Standard Display in the mouse functions area and then push
the left mouse button.
2. If the Chart page is not displayed, click the Chart tab to display it.
3. Enter desired depth in the Safety contour field.
Note: If the chart does not contain chosen depth contour, the system will automatically choose next deeper contour.
In the example above the safe water depth is set for 10 m.
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