Furuno FCV-1200L Operator's Manual page 51

ZOOM MARKER
Turns zoom marker on/off.
FREE SHIFT
Set shift value independently for each range (ON) or commonly for all range (OFF).
ECHO STRETCH
Displays the strong echoes long though the pulse length setting is short. It is useful for
distinguishing individual fish (e.x. squid) in plankton.
DEPTH UNIT
Selects unit of depth measurement; meters, feet, fathoms, hiro (Japanese), passi/braza.
SPEED UNIT
Selects unit of ship's speed; kt, km/h, sm/h.
TEMP UNIT
Sets unit of water temperature measurement; Celsius or Fahrenheit.
BOTTOM LEVEL
When seabed depth readout is unstable,
use this feature to stabilize it. The
setting range is -40 to 0, and the default
setting is 0.
If this setting value is too small, fish
echo may be regarded as bottom which
causes unstable depth readout.
Bottom lock display
Set the bottom
search so that this
line disappears.
1/1
LF
0 0
5
4
10
3
20
2
30
1
0
40
Seabed
0
3-3