FISH 4350 / 4380
Installation and Operation Manual
15
NAVMAN
Shadows
Shadows are created around areas where the ultrasonic beam cannot ‘see’. These areas include hollows
on the bottom or beside rocks and ledges, where the strong echoes returned off the rocks obscure the
weak echoes of the
Þ
sh and may also create a double bottom trace. See following for an example of
the sonar display in such an environment. A double bottom trace is shown on the display.
Sonar display of same area
Þ
sh is visible on the display
Þ
sh is hidden by the strong echoes off the
bottom and is not shown on the display
Example of shadows
Þ
sh is visible on the display
1 minute ago
30 seconds ago
Now
When the
Þ
sh symbol
option is on, any echo
returned that
Þ
ts the
pro
Þ
le of a
Þ
sh is
displayed on the screen
with a
Þ
sh symbol.
Navman
Þ
sh
Þ
nders display the most recent events on the right of the screen.
Moving boat
