5.20.1 A True Motion display mode should be provided.
The automatic reset of own ship may be initiated by its position on
the display, or time related, or both. Where the reset is selected
to occur at least on every scan or equivalent, this should be equivalent
to True Motion with a fixed origin (in practice equivalent to the
previous relative motion mode).
5.20.2 North Up and Course Up orientation modes
should be provided. Head Up may be provided when the display mode
is equivalent to True Motion with a fixed origin (in practice equivalent
to the previous relative motion Head Up mode).
5.20.3 An indication of the motion and orientation
mode should be provided.