Advancement Synchronized With Ship's Speed - Furuno 1824C-BB Operator's Manual

PICTURE ADVANCE
2/1
1/1
1/2
1/4
1/8
1/16
STOP
Picture advance window
4. Use the Trackball to select speed desired. The fractions in the window denote the
number of scan lines produced per transmission. For example, 1/8 means one scan line
is produced every eight transmissions. STOP freezes the display and it is convenient for
observing an echo.
5. Press the E: RETURN soft key followed by the MENU key to close the menu.
Note: When using the plotter/sounder combination display, advancement of the sounder
picture may be temporarily interrupted while the plotter display is being shifted or its display
range is being changed.

4.9.2 Advancement synchronized with ship's speed

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. The choice "SPD SENSING PRR" means the ship's speed dependent mode,
where the PRR changes automatically with ship's speed.
Same size
fish schools
FULL
SPEED
Speed
Actual Movement
How the speed-dependent picture advance mode works
HALF
SPEED
Speed-Dependent Picture Advance Mode
4. VIDEO SOUNDER OPERATION
Fish school shrinks as speed
is increased; expanded
as speed is decreased.
Normal Mode
Fish schools are shown
same size regardless
of ship's speed.
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