7.1.1 If the display equipment is capable of supporting
the presentation of multiple functions then there should be a clear
indication of the primary function supported by the presentation (e.g.
Radar, ECDIS). It should be possible to select the Radar presentation
(see 7.2) or the ECDIS presentation (see 7.3) by a simple operator
action.
7.1.2 If a radar image and an electronic chart
are displayed together, the chart and the radar image should use a
consistent common reference point and match in scale, projection and
orientation. Any offset should be indicated.
7.1.3 Range scales of 0.25, 0.5, 0.75, 1.5, 3,
6, 12 and 24 NM should be provided. Additional range scales are permitted.
These range scales do not apply when presenting raster chart data.
The range scale should be permanently indicated.
7.1.4 When range rings are displayed, the range
ring scale should be indicated.
7.1.5 No part of the operational display area
should be permanently used for presentation of information that is
not part of the navigation presentation (e.g. pop up displays, drop
down menus and information windows). Temporary, limited and relevant
alphanumeric data may be displayed adjacent to a selected symbol,
graphic or target within the operational display area.