Alarms and Cautions highlights have been standardises to help the user know what they’re looking at. This is when running monitoring (some ECDIS systems also on checking…)

You will now see that the advantage of this highlighted on screen within the cone or look ahead obviously shows any dangers or cautions within this area, the disadvantage is that there are several reports that are shown in confined or coastal waters and this clutters the display and therefore operators need to be more aware of their look ahead size.