Division 2.2.2 Navigation, short-term ahead

Navigation, short-term ahead, is the decision phase in the navigation process. In this phase traffic information has relevance for the process of navigation, including collision avoidance measures if necessary. This function deals with the observation of other vessels in the close surroundings of the own vessel.

The actual traffic information shall be exchanged continuously at least every 10 seconds. For some routes the authorities may set a predefined update rate (maximum two seconds).