Furuno FAR-2107(-BB) - Manual (Page 42)

1. RADAR OPERATION
1-20
Stern-up mode
The stern-up mode rotates the head-up mode picture, relative and true bearings
and display graphics 180°. This mode is useful on dual-radar tugboats when
backing up; one radar shows head-up and another shows stern-up. To enable
the stern-up mode, turn on STERN-UP on the 7 OPERATION menu.
Heading Line
North Marker
Stern-up mode