The AIS table shows a list of the vessels, base stations, aids to navigation and search and rescue aircraft from which you have received AIS signals. It is updated every 10.5 seconds. The table is sorted first by closest point of approach and second by how recently the object was last seen. Select an item in the table to display certain details of the object, namely its last known range and bearing from you, whether the range is steady or diverging or, if you are converging, the closest point of approach, the time the object was last seen and its unique identification number (MMSI). Double click the item, or click 'Find' to scroll the chart to that object and view more details about it.

In this example, we see that the three vessels in the refuge anchorage are stationary, but there is a small tanker moving slowly north west. She is currently 1.02 miles from us but, if both she and we maintain our current course and speed, the closest approach will be a mere 111 metres in 5 minutes 36 seconds. The tanker’s confirmed track in the last 5 minutes is shown by the solid blue line and her projected track in the next 5 minutes by the dashed grey line ahead of her. Our own boat is shown in red with our projected track in dashed grey. Since the tanker is clearly manoeuvring and the predicted closest approach is very tight, a decision on whether to change course is clearly required. back