Division 8.3.1 Test of the radar overlay

The radar image shall not be degraded by the chart picture (refer to point 4.3(c) of this Section).

The overlay of information regarding the position and orientation of other vessels shall be only displayed when:

• the information is up-to-date (nearly real-time), and

• the age of information does not exceed the maximum time out values provided in the first table in point 5.1(e) of Section 1, Performance Standard for Inland ECDIS. The symbols shall be marked as outdated, if the age of the information exceeds 30 seconds for moving vessels. The position information of the own vessel shall not be displayed, if it is received from a repeater station.

The overlay of information derived from tracking and tracing devices regarding the position and orientation of other vessels shall be faded out at a user-definable range. The activation of this feature and the selected range of the restricted area shall be indicated on the display.

If the heading of other vessels is available, the position and the orientation of those other vessels shall be displayed by:

• a directed triangle, or

• a true outline (to scale)

For all other vessels a generic symbol shall be used (an octagon is recommended, a circle shall be used for inland applications only).

It shall be possible to switch off the chart and any other information layer and to display only the radar picture by one easily accessible control element or menu area.

The chart picture shall be renewed not later than the radar picture.