Furuno FCV-1100L - Manual (Page 16)

1. OPERATIONAL OVERVIEW
1-8
DISCRIM 1/2 display
The discrim(ination) 1/2 screen shows the single picture on the right half of the
screen and the bottom-lock display and discriminator display occupy the left half
of the screen. The discriminator display shows the bottom as a straight line,
which is useful for determining bottom hardness.
Discrimination 1/2 display
DISCRIM 1/3 display
This display is similar to the DISCRIM 1/2 display except the bottom
discriminator display occupies the bottom one-third of the left half of the screen
as below.
Discrimination 1/3 display