Furuno FCV-30 - Manual (Page 36)

1. OPERATIONAL OVERVIEW
1-26
Ship’s speed dependent picture advance
With speed data provided by a speed-measuring device, picture advance speed may be set
according to ship’s speed, the ship’s speed dependent mode. As shown in the figure below
the horizontal scale of the display is not influenced by the change of ship’s speed, thus the
speed-dependent picture advance permits judgment of fish school size and abundance at
any speed.
Note: This feature is available with ship’s speed between 2 and 20 kts. If ship’s speed is
above or below those values, the picture is advanced using the upper or lower limit
whichever is closest to the actual ship’s speed.
FULL
SPEED
HALF
SPEED
Actual Movement
Same size
fish schools
Speed
Normal Mode
Speed-Dependent Picture Advance Mode
Fish school shrinks as speed
is increased; expanded
as speed is decreased.
Fish schools are shown
same size regardless
of ship’s speed.
How the ship’s speed dependent picture advance mode works