Furuno FSV-24 Operator's Manual page 93

Upward + downward looking net recorder display (ES2 mode)
The marks and indications which appear on the downward looking display are
also common to the upward + downward sounding display.
W
Figure 4-6 Echo sounder 2 display (Upward + downward looking display)
N
S
4. ECHO SOUNDER MODE
NAV DATA DISPLAY
150 60
0
30
25
E E
30
60
Ground rope
Upward
Sounding
Picture
0
0
Downward
Sounding
Picture
4-5