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Navman FISH 4350 Manual

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FISH 4350 / 4380 Installation and Operation Manual 13
NAVMAN
rate for normal usage. To calibrate the tempera-
ture readout, Þ rst measure the water temperature
with a thermometer known to be accurate.
Use the cursor keys
to display the temperature
readout box,
then increase or decrease the
value to match the measured temperature. The
temperature can be set from 32° to 99.9°F (0°
to 37.7°C) with a resolution of 0.1° unit.
To change the units between °F (Fahrenheit) or
°C (Celsius), see section 3-7 Setup > Units.
Fuel
Calibrating the fuel usage can improve the
accuracy of fuel measurements.
Twin engine installations require each fuel
transducer to be calibrated. This can be done
at the same time with two portable tanks or at
different times using one portable tank.
Calibrating the fuel transducer(s) requires
accurate measurement of the fuel consumption.
This is best done using a small portable tank. At
least 4 gallons (15 litres) of fuel should be used
to ensure an accurate calibration.
It is often very difÞ cult to Þ ll underß oor tanks
to the same level twice due to air pockets,
so the more fuel used, the more accurate the
calibration.
To calibrate the fuel transducer(s), perform the
following steps:
1. Record the level of the fuel in the tank(s).
2. Connect the portable tank(s) to the
engine through the fuel transducer(s).
3. Run the engine at normal cruising speed
until at least 4 gallons (15 litres) of fuel
has been used per engine.
4. Check the actual amount of fuel used per
engine by reÞ lling the portable tank(s) to
Note: Boat illustrated uses a through hull transducer
Water surface
Depth of transducer
Negative
value
Transducer
Positive
value
the original level and noting the reading(s)
from the fuel dispenser’s gauge.
5. Select Fuel. Use
or
to change the
reading to match that on the fuel dispens-
er’s gauge.
6. Press
when the reading is correct.
Note: If the fuel calibration options appear
to give erroneous readings after a while, Þ rst
check that the fuel sensor has been installed
correctly according to the installation instruc-
tions supplied with it, then see Appendix B
- Troubleshooting.
Keel Offset
Keel offset is a depth correction representing the
vertical distance between the depth transducer
and the location from which the depth is to be
measured.
Enter a positive keel offset value when the
transducer is located below the water surface
but the total depth is required.
Enter a negative keel offset value when the
depth below the deepest part of the boat is
required (such as the keel, the rudder or the
propeller) and the transducer is located closer
to the water surface.
Use the cursor keys
to select Keel offset,
then press
to display the Keel offset box.
Use the
or
cursor keys
to adjust the
value.
4-1 Interpreting the display
The sonar displays do not show a Þ xed distance
travelled by the boat; rather, they display a
history, showing what has passed below the
boat during a certain period of time.
The history of the sonar signal displayed
depends the depth of the water and the scroll
speed setting.
In shallow water, the echoes have a short
4 Using the FISH 4350 and FISH 4380
This section explains how to interpret the
sonar displays and how Þ sh are detected and
displayed.
It also describes Gain and Range and shows
examples of some of the different sonar
displays. Also see section 1-2 How the FISH
4350 and FISH 4380 works.
distance to travel between the bottom and the
boat. In deep water, the history moves across
the display more slowly because the echoes
take longer to travel between the bottom and
the boat. For example, when the scroll speed
is set to Fast, at depths over 600 ft (180 m) it
takes about 2 minutes for each vertical line of
pixels to move across the display, whereas at
… 13 …


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