FISH 4350 / 4380
Installation and Operation Manual
20
NAVMAN
5-4 Sonar A-Scope display
To show the A-Scope display, select Sonar A-
Scope and press . Use this to analyse the sonar
data in detail and optimize the Gain settings.
displays, by using the Gain setting. See section
4-3 Gain, for more information.
The strength of an echo at a particular depth
is shown by the length of the horizontal line at
that depth. A strong echo produces a long line
whereas a weak echo produces a short line.
Fish recognition
The echo strengths shown on the A-Scope can
be useful in recognising the type of
Þ
sh. Different
species of
Þ
sh have different sizes and shapes
of swim bladders. The air in the swim bladder
re
ß
ects the ultrasonic pulse, so the strength of
the echo varies between
Þ
sh species according
to the size and shape of the swim bladder.
When fishing among a school of fish and
catching them, note the
Þ
sh species and the
strength of the echo that it returns on the
A-Scope. Then, when that particular echo is
seen at future times on the
Þ
sh
Þ
nder, it is likely
to be the same
Þ
sh species.
The user can de
Þ
ne the level of the weakest
and strongest echoes to be shown on the sonar
Divider line
between
sonar
history and
A-Scope
Gain setting
(strongest
echo for
display)
Gain threshold
(weakest echo
for display)
To show the Fuel display, select
Fuel
and
press .
(See section 3-3 Setup > Fuel for information
about setting up the fuel values. If the number
of engines is set to
0
, the fuel features are
turned off.)
Used
shows total fuel used since this was last
reset with the
Clear Used
command.
R e m a i n i n g
shows the amount of fuel
remaining in the tank(s).
Flow
shows the fuel consumption per hour.
For twin engine installations, the fuel
ß
ow for
each engine is shown separately. This is useful
for checking that both engines are under the
same load.
Economy
is the distance travelled per unit of
fuel used. The
Þ
sh
Þ
nder calculates this from
the boat speed and fuel used. The bigger this
number, the better the fuel economy. Adjust
the throttle and trim to achieve the best fuel
economy. Note that the FISH 4380 uses a
paddlewheel transducer to measure speed,
used to calculate the fuel economy. Therefore,
calibration of the boat speed measurement is
essential for an accurate fuel economy reading.
See section 3-8 Setup > Calibrate.
5-5 Fuel display
(FISH 4380 only)
