Furuno 1761 MARK-3 Operator's Manual page 11

A
B
(A) Bird's eye view of situation
1-2
D
C
Own ship
(radar)
Figure 1-1 How radar works
Targets
A
B
C
Own ship
in center
(B) Radar picture of (A)
Heading marker
Range and bearing
of a target, relative
to own ship, are
readable on the PPI.
D